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fix: process coverage merging #37

Merged
merged 1 commit into from
Oct 21, 2018
Merged

fix: process coverage merging #37

merged 1 commit into from
Oct 21, 2018

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demurgos
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@demurgos demurgos commented Oct 9, 2018 •
edited by bcoe
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This commit uses the new merge algorithm to handle sub-processes. It fixes the issues reported in bcoe/v8-coverage-merge#7 and improves performance.

Checklist
  • npm test, tests passing
  • npm run test:snap (to update the snapshot)
  • tests and/or benchmarks are included
  • documentation is changed or added

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demurgos commented Oct 9, 2018 •
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Here is a comparison between nyc, c8#master and c8#fix-merge (applied to yargs):

nyc

nyc

c8#master

c8#master

c8#fix-merge

c8#fix-merge

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Pull Request Test Coverage Report for Build 54

  • 54 of 54 (100.0%) changed or added relevant lines in 1 file are covered.
  • 8 unchanged lines in 3 files lost coverage.
  • Overall coverage increased (+0.4%) to 91.319%
Files with Coverage Reduction New Missed Lines %
lib/parse-args.js 2 92.05%
bin/c8.js 3 80.0%
lib/report.js 3 94.67%
Totals Coverage Status
Change from base Build 53: 0.4%
Covered Lines: 237
Relevant Lines: 249
💛 - Coveralls

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Pull Request Test Coverage Report for Build 55

  • 54 of 54 (100.0%) changed or added relevant lines in 1 file are covered.
  • 8 unchanged lines in 3 files lost coverage.
  • Overall coverage increased (+0.4%) to 91.319%
Files with Coverage Reduction New Missed Lines %
lib/parse-args.js 2 92.05%
bin/c8.js 3 80.0%
lib/report.js 3 94.67%
Totals Coverage Status
Change from base Build 53: 0.4%
Covered Lines: 237
Relevant Lines: 249
💛 - Coveralls

profnandaa
profnandaa reviewed Oct 10, 2018
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LGTM for the most part but just concerned about the c88/v8-coverage package; what's it's maintenance like? Might it be future tech debt?

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demurgos commented Oct 10, 2018 •
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@profnandaa
Regarding @c88/v8-coverage: this is a package I wrote implementing various utilities to manipulate V8 coverages: clone, normalize and merge (also planned: diff). It contains the merge algorithm described by the link in the OP. I worked on it during the last few weeks: there are more details on the Slack discussion.
Here is the repo. It has a few implementations (Typescript, Rust, native Node module), test vectors, all the integrations you'd expect, benchmarks, etc. Regarding maintenance: I sent an invitation to @bcoe, and can send one to others if interested. The API should remain relatively stable. I am waiting on normalization to be more tested before going for 1.0.0. The main risk of change is switching to an async API by default if it's needed to get more perf (e.g. using multi-threading).

The core of the algorithm is in these two files: merge.ts and range-tree.ts. I am confident with the algorithm but it's important for me that someone else understands in depth how it works. Could you look at it? I am available on Github and Slack to explain the details. There's this document with some information. I can add more details for the harder sections if needed.

This was referenced Oct 10, 2018
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Closes #27

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bcoe commented Oct 12, 2018

@demurgos I apologize, created a merge conflict landing @profnandaa's async work, any chance you could rebase?

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demurgos commented Oct 12, 2018 •
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I rebased the PR

@demurgos
fix: process coverage merging
8187274 
This commit uses the [new merge algorithm][merge] to handle sub-processes. It fixes the issues reported in bcoe/v8-coverage-merge#7 and improves performance.

[merge]: https://github.com/demurgos/v8-coverage/blob/master/docs/merge.md

Closes bcoe#27
@profnandaa profnandaa changed the base branch from master to master-3.3 October 18, 2018 22:02
profnandaa
profnandaa approved these changes Oct 18, 2018
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Thanks @demurgos for the solid work, especially on the c8-coverage/merge. As we've discussed in Slack, we land this work to master-3.3 to await further review and discussion. And once you are back from vacation 🌴, we finalize on landing to master, and I guess by then, we should bump semver-minor.

cc. @bcoe

@profnandaa profnandaa changed the base branch from master-3.3 to master October 20, 2018 05:09
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From the call we had yesterday, I approve that we land it to master.

@bcoe bcoe merged commit 67959b4 into bcoe:master Oct 21, 2018
@github-actions github-actions bot mentioned this pull request Apr 20, 2022
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github-actions bot pushed a commit to prantlf/c8 that referenced this pull request Apr 2, 2023
@semantic-release-bot
chore(release): 1.0.0 [skip ci]
8a76426 
# 1.0.0 (2023-04-02)

### Bug Fixes

* `--all` now respects `--extension` flag. ([bcoe#357](https://github.com/prantlf/c8/issues/357)) ([a5deb27](a5deb27))
* add missing space in text ([bcoe#245](https://github.com/prantlf/c8/issues/245)) ([efe6d04](efe6d04))
* address bugs with source remapping on Windows ([bcoe#301](https://github.com/prantlf/c8/issues/301)) ([c817902](c817902))
* address file:// issue with CJS ([bcoe#39](https://github.com/prantlf/c8/issues/39)) ([d4f9cab](d4f9cab))
* all flag not propagated to check-coverage command ([bcoe#188](https://github.com/prantlf/c8/issues/188)) ([86eaf72](86eaf72))
* **config:** support configuration inheritance ([bcoe#343](https://github.com/prantlf/c8/issues/343)) ([e81ed5d](e81ed5d))
* **deps:** merging failed when the same script occurred multiple times in the same report ([bcoe#147](https://github.com/prantlf/c8/issues/147)) ([1ebcaf9](1ebcaf9))
* **deps:** update dependency find-up to v4 ([bcoe#119](https://github.com/prantlf/c8/issues/119)) ([c568d96](c568d96))
* **deps:** update dependency find-up to v5 ([bcoe#242](https://github.com/prantlf/c8/issues/242)) ([8a0cfd7](8a0cfd7))
* **deps:** update dependency furi to v2 ([bcoe#193](https://github.com/prantlf/c8/issues/193)) ([6b9af6e](6b9af6e))
* **deps:** update dependency rimraf to v3 ([bcoe#132](https://github.com/prantlf/c8/issues/132)) ([7601748](7601748))
* **deps:** update dependency v8-to-istanbul to v4 ([bcoe#167](https://github.com/prantlf/c8/issues/167)) ([97b9769](97b9769))
* **deps:** update dependency yargs to v14 ([bcoe#134](https://github.com/prantlf/c8/issues/134)) ([e49737f](e49737f))
* **deps:** update dependency yargs to v15 ([bcoe#164](https://github.com/prantlf/c8/issues/164)) ([e41a483](e41a483))
* **deps:** update dependency yargs to v16 ([bcoe#251](https://github.com/prantlf/c8/issues/251)) ([0436816](0436816))
* **deps:** update dependency yargs-parser to v13 ([bcoe#124](https://github.com/prantlf/c8/issues/124)) ([1eb3394](1eb3394))
* **deps:** update dependency yargs-parser to v14 ([bcoe#144](https://github.com/prantlf/c8/issues/144)) ([9b3d089](9b3d089))
* **deps:** update dependency yargs-parser to v15 ([bcoe#153](https://github.com/prantlf/c8/issues/153)) ([80153de](80153de))
* **deps:** update dependency yargs-parser to v16 ([bcoe#157](https://github.com/prantlf/c8/issues/157)) ([15746e5](15746e5))
* **deps:** update dependency yargs-parser to v17 ([bcoe#201](https://github.com/prantlf/c8/issues/201)) ([d730c63](d730c63))
* **deps:** update dependency yargs-parser to v18 ([bcoe#202](https://github.com/prantlf/c8/issues/202)) ([983de44](983de44))
* **deps:** update dependency yargs-parser to v19 ([bcoe#241](https://github.com/prantlf/c8/issues/241)) ([baa01df](baa01df))
* **deps:** update dependency yargs-parser to v20 ([bcoe#252](https://github.com/prantlf/c8/issues/252)) ([ae845f0](ae845f0))
* **deps:** update deps to address warning in cross-spawn ([bcoe#141](https://github.com/prantlf/c8/issues/141)) ([4b66221](4b66221))
* **deps:** update deps to latest ([bcoe#384](https://github.com/prantlf/c8/issues/384)) ([78eac8c](78eac8c)), closes [bcoe#375](https://github.com/prantlf/c8/issues/375)
* **deps:** v8-to-istanbul with fix for Windows paths ([bcoe#311](https://github.com/prantlf/c8/issues/311)) ([ef1b875](ef1b875))
* **deps:** v8-to-istanbul with patch for crasher ([bcoe#200](https://github.com/prantlf/c8/issues/200)) ([d4b7d80](d4b7d80))
* **deps:** v8-to-istnbul with fixes for Node 10/18 ([bcoe#392](https://github.com/prantlf/c8/issues/392)) ([d5f642a](d5f642a))
* do not override NODE_V8_COVERAGE if set ([bcoe#70](https://github.com/prantlf/c8/issues/70)) ([8bb67b0](8bb67b0))
* don't load JSON that does not look like coverage ([bcoe#146](https://github.com/prantlf/c8/issues/146)) ([a6481f1](a6481f1))
* escaping issue with cobertura reporter ([bcoe#203](https://github.com/prantlf/c8/issues/203)) ([e93747b](e93747b))
* exclude coverage of the CJS-ESM bridge from results ([bcoe#83](https://github.com/prantlf/c8/issues/83)) ([da2c945](da2c945))
* exit with code 1 when report output fails ([bcoe#92](https://github.com/prantlf/c8/issues/92)) ([a27b694](a27b694))
* file URL to system path conversion ([bcoe#46](https://github.com/prantlf/c8/issues/46)) ([e7f8cf2](e7f8cf2))
* fix package.json `test:snap` script to use cross-env ([bcoe#366](https://github.com/prantlf/c8/issues/366)) ([5d2981c](5d2981c))
* Fix usage of excludeAfterRemap not to set the coverage always to 100 ([9113449](9113449)), closes [bcoe#462](https://github.com/prantlf/c8/issues/462)
* float patch for branch/function coverage merge bug ([bcoe#56](https://github.com/prantlf/c8/issues/56)) ([1de0cca](1de0cca))
* HTML report now has correct source positions for Node >10.16.0 ([bcoe#125](https://github.com/prantlf/c8/issues/125)) ([c49fa7f](c49fa7f))
* ignore missing source maps in raw coverage output ([bcoe#233](https://github.com/prantlf/c8/issues/233)) ([eed98af](eed98af))
* make tests run on Windows ([bcoe#25](https://github.com/prantlf/c8/issues/25)) ([08e44d0](08e44d0))
* make tmp directory regardless of clean ([44d2185](44d2185))
* **perf:** cache `this.exclude.shouldInstrument` for improved performance ([bcoe#388](https://github.com/prantlf/c8/issues/388)) ([8b36f23](8b36f23))
* pin to functional version of spawn-wrap ([d1ced8c](d1ced8c))
* process coverage merging ([bcoe#37](https://github.com/prantlf/c8/issues/37)) ([67959b4](67959b4))
* regex flags in dependency were breaking Node 8 ([a9d9645](a9d9645))
* remove the unmaintained mkdirp dependency ([bcoe#91](https://github.com/prantlf/c8/issues/91)) ([a465b65](a465b65))
* snapshot ([7fd9e13](7fd9e13))
* support [email protected] built-in modules ([bcoe#265](https://github.com/prantlf/c8/issues/265)) ([1b90a22](1b90a22))
* switch to mkdirp for Node 8 ([206b83f](206b83f))
* temporary files should be in tmp folder ([bcoe#106](https://github.com/prantlf/c8/issues/106)) ([64dd2e6](64dd2e6))
* tweak inspector event timing ([bcoe#6](https://github.com/prantlf/c8/issues/6)) ([01f654e](01f654e))
* **types:** add excludeAfterRemap and allowExternal  ([bcoe#297](https://github.com/prantlf/c8/issues/297)) ([e32a53f](e32a53f))
* Upgrade dependencies ([c288f5f](c288f5f))
* upgrade to @bcoe/v8-coverage with breaking regex dropped ([6c28e7f](6c28e7f))
* **v8-to-istanbul:** fixes shebang handling/ignore behavior ([bcoe#267](https://github.com/prantlf/c8/issues/267)) ([21cd41f](21cd41f))
* **v8-to-istanbul:** pull in fix for missing branches ([bcoe#258](https://github.com/prantlf/c8/issues/258)) ([eaffa78](eaffa78))
* **v8-to-istanbul:** revert off by one that broke TypeScript ([bcoe#262](https://github.com/prantlf/c8/issues/262)) ([81ab5b7](81ab5b7))
* we were not exiting with 1 if mkdir failed ([bcoe#89](https://github.com/prantlf/c8/issues/89)) ([fb02ed6](fb02ed6))

* feat!: use Node.js' source-map cache, to support tools like ts-node (bcoe#152) ([53bba15](53bba15)), closes [bcoe#152](https://github.com/prantlf/c8/issues/152)
* feat!: default temp directory to report directory (bcoe#102) ([8602f4a](8602f4a)), closes [bcoe#102](https://github.com/prantlf/c8/issues/102)

### Features

* `--100` ([bcoe#332](https://github.com/prantlf/c8/issues/332)) ([4205f2f](4205f2f))
* add --config option and documentation on options and configs ([bcoe#308](https://github.com/prantlf/c8/issues/308)) ([99436ef](99436ef))
* add --exclude-node-modules option ([bcoe#321](https://github.com/prantlf/c8/issues/321)) ([a4733c6](a4733c6))
* add --extension option ([bcoe#331](https://github.com/prantlf/c8/issues/331)) ([ff01cd8](ff01cd8))
* add --report-dir alias (for consistency with nyc) ([0dd1b04](0dd1b04))
* add --skip-full ([bcoe#287](https://github.com/prantlf/c8/issues/287)) ([8b01b63](8b01b63))
* add `skipFull` and `excludeNodeModules` to type definitions ([bcoe#417](https://github.com/prantlf/c8/issues/417)) ([b93b9c0](b93b9c0))
* add support for 1:1 source-maps ([bcoe#85](https://github.com/prantlf/c8/issues/85)) ([6ca4345](6ca4345))
* add support for ignoring lines, functions, and blocks ([bcoe#87](https://github.com/prantlf/c8/issues/87)) ([c66950e](c66950e))
* add thresholds for enforcing coverage percentage ([bcoe#59](https://github.com/prantlf/c8/issues/59)) ([70e8943](70e8943))
* adds --all functionality ([bcoe#158](https://github.com/prantlf/c8/issues/158)) ([2eb631e](2eb631e))
* adds support for 1:many source maps ([bcoe#238](https://github.com/prantlf/c8/issues/238)) ([dbf94a0](dbf94a0))
* adds TypeScript definitions ([d39801b](d39801b)), closes [bcoe#195](https://github.com/prantlf/c8/issues/195)
* **all:** handle base64 inline source maps ([bcoe#283](https://github.com/prantlf/c8/issues/283)) ([3f12dd4](3f12dd4))
* allow  --reports-dir to be configured ([bcoe#65](https://github.com/prantlf/c8/issues/65)) ([5ab31f5](5ab31f5))
* allow relative paths to be optionally included ([3806c79](3806c79))
* allow script wrapper length to be specified ([bcoe#51](https://github.com/prantlf/c8/issues/51)) ([a22c4e0](a22c4e0))
* first pass at functional prototype without subprocess support ([bcoe#5](https://github.com/prantlf/c8/issues/5)) ([9534f56](9534f56))
* foreground-child's done() method was not being called ([bcoe#82](https://github.com/prantlf/c8/issues/82)) ([fde596e](fde596e))
* implement Istanbul reporting ([bcoe#8](https://github.com/prantlf/c8/issues/8)) ([8e430bf](8e430bf))
* improve test assertions ([bcoe#28](https://github.com/prantlf/c8/issues/28)) ([522720e](522720e))
* introduce --exclude-after-remap flag ([bcoe#293](https://github.com/prantlf/c8/issues/293)) ([53c4234](53c4234)), closes [bcoe#224](https://github.com/prantlf/c8/issues/224)
* load .nycrc/.nycrc.json to simplify migration ([bcoe#100](https://github.com/prantlf/c8/issues/100)) ([bd7484f](bd7484f))
* playing around with initial implementation ([18f5471](18f5471))
* support --check-coverage for reports ([bcoe#60](https://github.com/prantlf/c8/issues/60)) ([b542930](b542930))
* support for instrumenting files outside of current working directory ([7e53a0e](7e53a0e))
* support ignore start/stop comment ([bcoe#273](https://github.com/prantlf/c8/issues/273)) ([90949fa](90949fa)), closes [bcoe#271](https://github.com/prantlf/c8/issues/271)
* support passing reporter options ([bcoe#423](https://github.com/prantlf/c8/issues/423)) ([bc347a9](bc347a9))
* switch to stderr and default port ([bcoe#7](https://github.com/prantlf/c8/issues/7)) ([bb117b7](bb117b7))
* switch to using Node's built in coverage ([bcoe#22](https://github.com/prantlf/c8/issues/22)) ([3c1b92b](3c1b92b))
* **types:** add typings for reporterOptions ([bcoe#446](https://github.com/prantlf/c8/issues/446)) ([3646e6e](3646e6e))
* use debuglog rather than console.warn ([bcoe#279](https://github.com/prantlf/c8/issues/279)) ([7c04a4d](7c04a4d))
* use process.stdout.columns for reporter maxCols ([bcoe#409](https://github.com/prantlf/c8/issues/409)) ([7731574](7731574))
* warn instead of throw on exception ([bcoe#29](https://github.com/prantlf/c8/issues/29)) ([a8620d4](a8620d4))

### BREAKING CHANGES

* Node.js' source-map and lineLength cache is now used to remap coverage output (this allows tools like ts-node to be supported, which transpile at runtime).
* temp directory now defaults to setting for report directory
* c8 will now load source-maps if possible and remap coverage accordingly
* switches to using NODE_V8_COVERAGE rather than inspector directly
* dropped subprocess support for the time being, while we march towards an initial implementation.
github-actions bot pushed a commit to prantlf/c8 that referenced this pull request Apr 2, 2023
@semantic-release-bot
chore(release): 1.0.0 [skip ci]
496d2ae 
# 1.0.0 (2023-04-02)

### Bug Fixes

* `--all` now respects `--extension` flag. ([bcoe#357](https://github.com/prantlf/c8/issues/357)) ([a5deb27](a5deb27))
* add missing space in text ([bcoe#245](https://github.com/prantlf/c8/issues/245)) ([efe6d04](efe6d04))
* address bugs with source remapping on Windows ([bcoe#301](https://github.com/prantlf/c8/issues/301)) ([c817902](c817902))
* address file:// issue with CJS ([bcoe#39](https://github.com/prantlf/c8/issues/39)) ([d4f9cab](d4f9cab))
* all flag not propagated to check-coverage command ([bcoe#188](https://github.com/prantlf/c8/issues/188)) ([86eaf72](86eaf72))
* **config:** support configuration inheritance ([bcoe#343](https://github.com/prantlf/c8/issues/343)) ([e81ed5d](e81ed5d))
* **deps:** merging failed when the same script occurred multiple times in the same report ([bcoe#147](https://github.com/prantlf/c8/issues/147)) ([1ebcaf9](1ebcaf9))
* **deps:** update dependency find-up to v4 ([bcoe#119](https://github.com/prantlf/c8/issues/119)) ([c568d96](c568d96))
* **deps:** update dependency find-up to v5 ([bcoe#242](https://github.com/prantlf/c8/issues/242)) ([8a0cfd7](8a0cfd7))
* **deps:** update dependency furi to v2 ([bcoe#193](https://github.com/prantlf/c8/issues/193)) ([6b9af6e](6b9af6e))
* **deps:** update dependency rimraf to v3 ([bcoe#132](https://github.com/prantlf/c8/issues/132)) ([7601748](7601748))
* **deps:** update dependency v8-to-istanbul to v4 ([bcoe#167](https://github.com/prantlf/c8/issues/167)) ([97b9769](97b9769))
* **deps:** update dependency yargs to v14 ([bcoe#134](https://github.com/prantlf/c8/issues/134)) ([e49737f](e49737f))
* **deps:** update dependency yargs to v15 ([bcoe#164](https://github.com/prantlf/c8/issues/164)) ([e41a483](e41a483))
* **deps:** update dependency yargs to v16 ([bcoe#251](https://github.com/prantlf/c8/issues/251)) ([0436816](0436816))
* **deps:** update dependency yargs-parser to v13 ([bcoe#124](https://github.com/prantlf/c8/issues/124)) ([1eb3394](1eb3394))
* **deps:** update dependency yargs-parser to v14 ([bcoe#144](https://github.com/prantlf/c8/issues/144)) ([9b3d089](9b3d089))
* **deps:** update dependency yargs-parser to v15 ([bcoe#153](https://github.com/prantlf/c8/issues/153)) ([80153de](80153de))
* **deps:** update dependency yargs-parser to v16 ([bcoe#157](https://github.com/prantlf/c8/issues/157)) ([15746e5](15746e5))
* **deps:** update dependency yargs-parser to v17 ([bcoe#201](https://github.com/prantlf/c8/issues/201)) ([d730c63](d730c63))
* **deps:** update dependency yargs-parser to v18 ([bcoe#202](https://github.com/prantlf/c8/issues/202)) ([983de44](983de44))
* **deps:** update dependency yargs-parser to v19 ([bcoe#241](https://github.com/prantlf/c8/issues/241)) ([baa01df](baa01df))
* **deps:** update dependency yargs-parser to v20 ([bcoe#252](https://github.com/prantlf/c8/issues/252)) ([ae845f0](ae845f0))
* **deps:** update deps to address warning in cross-spawn ([bcoe#141](https://github.com/prantlf/c8/issues/141)) ([4b66221](4b66221))
* **deps:** update deps to latest ([bcoe#384](https://github.com/prantlf/c8/issues/384)) ([78eac8c](78eac8c)), closes [bcoe#375](https://github.com/prantlf/c8/issues/375)
* **deps:** v8-to-istanbul with fix for Windows paths ([bcoe#311](https://github.com/prantlf/c8/issues/311)) ([ef1b875](ef1b875))
* **deps:** v8-to-istanbul with patch for crasher ([bcoe#200](https://github.com/prantlf/c8/issues/200)) ([d4b7d80](d4b7d80))
* **deps:** v8-to-istnbul with fixes for Node 10/18 ([bcoe#392](https://github.com/prantlf/c8/issues/392)) ([d5f642a](d5f642a))
* do not override NODE_V8_COVERAGE if set ([bcoe#70](https://github.com/prantlf/c8/issues/70)) ([8bb67b0](8bb67b0))
* don't load JSON that does not look like coverage ([bcoe#146](https://github.com/prantlf/c8/issues/146)) ([a6481f1](a6481f1))
* escaping issue with cobertura reporter ([bcoe#203](https://github.com/prantlf/c8/issues/203)) ([e93747b](e93747b))
* exclude coverage of the CJS-ESM bridge from results ([bcoe#83](https://github.com/prantlf/c8/issues/83)) ([da2c945](da2c945))
* exit with code 1 when report output fails ([bcoe#92](https://github.com/prantlf/c8/issues/92)) ([a27b694](a27b694))
* file URL to system path conversion ([bcoe#46](https://github.com/prantlf/c8/issues/46)) ([e7f8cf2](e7f8cf2))
* fix package.json `test:snap` script to use cross-env ([bcoe#366](https://github.com/prantlf/c8/issues/366)) ([5d2981c](5d2981c))
* Fix usage of excludeAfterRemap not to set the coverage always to 100 ([9113449](9113449)), closes [bcoe#462](https://github.com/prantlf/c8/issues/462)
* float patch for branch/function coverage merge bug ([bcoe#56](https://github.com/prantlf/c8/issues/56)) ([1de0cca](1de0cca))
* HTML report now has correct source positions for Node >10.16.0 ([bcoe#125](https://github.com/prantlf/c8/issues/125)) ([c49fa7f](c49fa7f))
* ignore missing source maps in raw coverage output ([bcoe#233](https://github.com/prantlf/c8/issues/233)) ([eed98af](eed98af))
* make tests run on Windows ([bcoe#25](https://github.com/prantlf/c8/issues/25)) ([08e44d0](08e44d0))
* make tmp directory regardless of clean ([44d2185](44d2185))
* **perf:** cache `this.exclude.shouldInstrument` for improved performance ([bcoe#388](https://github.com/prantlf/c8/issues/388)) ([8b36f23](8b36f23))
* pin to functional version of spawn-wrap ([d1ced8c](d1ced8c))
* process coverage merging ([bcoe#37](https://github.com/prantlf/c8/issues/37)) ([67959b4](67959b4))
* regex flags in dependency were breaking Node 8 ([a9d9645](a9d9645))
* remove the unmaintained mkdirp dependency ([bcoe#91](https://github.com/prantlf/c8/issues/91)) ([a465b65](a465b65))
* snapshot ([7fd9e13](7fd9e13))
* support [email protected] built-in modules ([bcoe#265](https://github.com/prantlf/c8/issues/265)) ([1b90a22](1b90a22))
* switch to mkdirp for Node 8 ([206b83f](206b83f))
* temporary files should be in tmp folder ([bcoe#106](https://github.com/prantlf/c8/issues/106)) ([64dd2e6](64dd2e6))
* tweak inspector event timing ([bcoe#6](https://github.com/prantlf/c8/issues/6)) ([01f654e](01f654e))
* **types:** add excludeAfterRemap and allowExternal  ([bcoe#297](https://github.com/prantlf/c8/issues/297)) ([e32a53f](e32a53f))
* Upgrade dependencies ([985b219](985b219))
* upgrade to @bcoe/v8-coverage with breaking regex dropped ([6c28e7f](6c28e7f))
* **v8-to-istanbul:** fixes shebang handling/ignore behavior ([bcoe#267](https://github.com/prantlf/c8/issues/267)) ([21cd41f](21cd41f))
* **v8-to-istanbul:** pull in fix for missing branches ([bcoe#258](https://github.com/prantlf/c8/issues/258)) ([eaffa78](eaffa78))
* **v8-to-istanbul:** revert off by one that broke TypeScript ([bcoe#262](https://github.com/prantlf/c8/issues/262)) ([81ab5b7](81ab5b7))
* we were not exiting with 1 if mkdir failed ([bcoe#89](https://github.com/prantlf/c8/issues/89)) ([fb02ed6](fb02ed6))

* feat!: use Node.js' source-map cache, to support tools like ts-node (bcoe#152) ([53bba15](53bba15)), closes [bcoe#152](https://github.com/prantlf/c8/issues/152)
* feat!: default temp directory to report directory (bcoe#102) ([8602f4a](8602f4a)), closes [bcoe#102](https://github.com/prantlf/c8/issues/102)

### Features

* `--100` ([bcoe#332](https://github.com/prantlf/c8/issues/332)) ([4205f2f](4205f2f))
* add --config option and documentation on options and configs ([bcoe#308](https://github.com/prantlf/c8/issues/308)) ([99436ef](99436ef))
* add --exclude-node-modules option ([bcoe#321](https://github.com/prantlf/c8/issues/321)) ([a4733c6](a4733c6))
* add --extension option ([bcoe#331](https://github.com/prantlf/c8/issues/331)) ([ff01cd8](ff01cd8))
* add --report-dir alias (for consistency with nyc) ([0dd1b04](0dd1b04))
* add --skip-full ([bcoe#287](https://github.com/prantlf/c8/issues/287)) ([8b01b63](8b01b63))
* add `skipFull` and `excludeNodeModules` to type definitions ([bcoe#417](https://github.com/prantlf/c8/issues/417)) ([b93b9c0](b93b9c0))
* add support for 1:1 source-maps ([bcoe#85](https://github.com/prantlf/c8/issues/85)) ([6ca4345](6ca4345))
* add support for ignoring lines, functions, and blocks ([bcoe#87](https://github.com/prantlf/c8/issues/87)) ([c66950e](c66950e))
* add thresholds for enforcing coverage percentage ([bcoe#59](https://github.com/prantlf/c8/issues/59)) ([70e8943](70e8943))
* adds --all functionality ([bcoe#158](https://github.com/prantlf/c8/issues/158)) ([2eb631e](2eb631e))
* adds support for 1:many source maps ([bcoe#238](https://github.com/prantlf/c8/issues/238)) ([dbf94a0](dbf94a0))
* adds TypeScript definitions ([d39801b](d39801b)), closes [bcoe#195](https://github.com/prantlf/c8/issues/195)
* **all:** handle base64 inline source maps ([bcoe#283](https://github.com/prantlf/c8/issues/283)) ([3f12dd4](3f12dd4))
* allow  --reports-dir to be configured ([bcoe#65](https://github.com/prantlf/c8/issues/65)) ([5ab31f5](5ab31f5))
* allow relative paths to be optionally included ([3806c79](3806c79))
* allow script wrapper length to be specified ([bcoe#51](https://github.com/prantlf/c8/issues/51)) ([a22c4e0](a22c4e0))
* first pass at functional prototype without subprocess support ([bcoe#5](https://github.com/prantlf/c8/issues/5)) ([9534f56](9534f56))
* foreground-child's done() method was not being called ([bcoe#82](https://github.com/prantlf/c8/issues/82)) ([fde596e](fde596e))
* implement Istanbul reporting ([bcoe#8](https://github.com/prantlf/c8/issues/8)) ([8e430bf](8e430bf))
* improve test assertions ([bcoe#28](https://github.com/prantlf/c8/issues/28)) ([522720e](522720e))
* introduce --exclude-after-remap flag ([bcoe#293](https://github.com/prantlf/c8/issues/293)) ([53c4234](53c4234)), closes [bcoe#224](https://github.com/prantlf/c8/issues/224)
* load .nycrc/.nycrc.json to simplify migration ([bcoe#100](https://github.com/prantlf/c8/issues/100)) ([bd7484f](bd7484f))
* playing around with initial implementation ([18f5471](18f5471))
* support --check-coverage for reports ([bcoe#60](https://github.com/prantlf/c8/issues/60)) ([b542930](b542930))
* support for instrumenting files outside of current working directory ([7e53a0e](7e53a0e))
* support ignore start/stop comment ([bcoe#273](https://github.com/prantlf/c8/issues/273)) ([90949fa](90949fa)), closes [bcoe#271](https://github.com/prantlf/c8/issues/271)
* support passing reporter options ([bcoe#423](https://github.com/prantlf/c8/issues/423)) ([bc347a9](bc347a9))
* switch to stderr and default port ([bcoe#7](https://github.com/prantlf/c8/issues/7)) ([bb117b7](bb117b7))
* switch to using Node's built in coverage ([bcoe#22](https://github.com/prantlf/c8/issues/22)) ([3c1b92b](3c1b92b))
* **types:** add typings for reporterOptions ([bcoe#446](https://github.com/prantlf/c8/issues/446)) ([3646e6e](3646e6e))
* use debuglog rather than console.warn ([bcoe#279](https://github.com/prantlf/c8/issues/279)) ([7c04a4d](7c04a4d))
* use process.stdout.columns for reporter maxCols ([bcoe#409](https://github.com/prantlf/c8/issues/409)) ([7731574](7731574))
* warn instead of throw on exception ([bcoe#29](https://github.com/prantlf/c8/issues/29)) ([a8620d4](a8620d4))

### BREAKING CHANGES

* Node.js' source-map and lineLength cache is now used to remap coverage output (this allows tools like ts-node to be supported, which transpile at runtime).
* temp directory now defaults to setting for report directory
* c8 will now load source-maps if possible and remap coverage accordingly
* switches to using NODE_V8_COVERAGE rather than inspector directly
* dropped subprocess support for the time being, while we march towards an initial implementation.
mcknasty pushed a commit to mcknasty/c8 that referenced this pull request Feb 2, 2024
@demurgos @bcoe
fix: process coverage merging (bcoe#37)
2ab914e
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@profnandaa profnandaa profnandaa approved these changes

@TimothyGu TimothyGu Awaiting requested review from TimothyGu

@JaKXz JaKXz Awaiting requested review from JaKXz

@bcoe bcoe Awaiting requested review from bcoe

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@demurgos @coveralls @bcoe @profnandaa @JaKXz