refactor: use execa instead of child_process for VCS commands

CHANGELOG.md

@@ -17,6 +17,7 @@
 - `[docs]` Explain how to rewrite assertions to avoid large irrelevant diff ([#6971](https://github.com/facebook/jest/pull/6971))
 - `[examples]` add example using Babel 7 ([#6983](https://github.com/facebook/jest/pull/6983))
 - `[docs]` Replace shallow equality with referential identity in `ExpectAPI.md` ([#6991](https://github.com/facebook/jest/pull/6991))
+- `[jest-changed-files]` Refactor to use `execa` over `child_process` ([#6987](https://github.com/facebook/jest/pull/6987))
 
 ## 23.6.0
 

packages/jest-changed-files/package.json

@@ -8,6 +8,7 @@
   "license": "MIT",
   "main": "build/index.js",
   "dependencies": {
+    "execa": "^1.0.0",
     "throat": "^4.0.0"
   }
 }

packages/jest-changed-files/src/git.js

@@ -11,37 +11,19 @@ import type {Path} from 'types/Config';
 import type {Options, SCMAdapter} from 'types/ChangedFiles';
 
 import path from 'path';
-import childProcess from 'child_process';
+import execa from 'execa';
 
 const findChangedFilesUsingCommand = async (
   args: Array<string>,
   cwd: Path,
-): Promise<Array<Path>> =>
-  new Promise((resolve, reject) => {
-    const child = childProcess.spawn('git', args, {cwd});
-    let stdout = '';
-    let stderr = '';
-    child.stdout.on('data', data => (stdout += data));
-    child.stderr.on('data', data => (stderr += data));
-    child.on('error', e => reject(e));
-    child.on('close', code => {
-      if (code === 0) {
-        stdout = stdout.trim();
-        if (stdout === '') {
-          resolve([]);
-        } else {
-          resolve(
-            stdout
-              .split('\n')
-              .filter(s => s !== '')
-              .map(changedPath => path.resolve(cwd, changedPath)),
-          );
-        }
-      } else {
-        reject(code + ': ' + stderr);
-      }
-    });
-  });
+): Promise<Array<Path>> => {
+  const result = await execa('git', args, {cwd});
+
+  return result.stdout
+    .split('\n')
+    .filter(s => s !== '')
+    .map(changedPath => path.resolve(cwd, changedPath));
+};
 
 const adapter: SCMAdapter = {
   findChangedFiles: async (
@@ -54,7 +36,7 @@ const adapter: SCMAdapter = {
     const includePaths: Array<Path> = (options && options.includePaths) || [];
 
     if (options && options.lastCommit) {
-      return await findChangedFilesUsingCommand(
+      return findChangedFilesUsingCommand(
         ['show', '--name-only', '--pretty=%b', 'HEAD'].concat(includePaths),
         cwd,
       );
@@ -81,7 +63,7 @@ const adapter: SCMAdapter = {
       );
       return [...committed, ...staged, ...unstaged];
     } else {
-      return await findChangedFilesUsingCommand(
+      return findChangedFilesUsingCommand(
         ['ls-files', '--other', '--modified', '--exclude-standard'].concat(
           includePaths,
         ),
@@ -90,19 +72,17 @@ const adapter: SCMAdapter = {
     }
   },
 
-  getRoot: async (cwd: string): Promise<?string> =>
-    new Promise(resolve => {
-      try {
-        let stdout = '';
-        const options = ['rev-parse', '--show-toplevel'];
-        const child = childProcess.spawn('git', options, {cwd});
-        child.stdout.on('data', data => (stdout += data));
-        child.on('error', () => resolve(null));
-        child.on('close', code => resolve(code === 0 ? stdout.trim() : null));
-      } catch (e) {
-        resolve(null);
-      }
-    }),
+  getRoot: async (cwd: string): Promise<?string> => {
+    const options = ['rev-parse', '--show-toplevel'];
+
+    try {
+      const result = await execa('git', options, {cwd});
+
+      return result.stdout;
+    } catch (e) {
+      return null;
+    }
+  },
 };
 
 export default adapter;

packages/jest-changed-files/src/hg.js

@@ -11,7 +11,7 @@ import type {Path} from 'types/Config';
 import type {Options, SCMAdapter} from 'types/ChangedFiles';
 
 import path from 'path';
-import childProcess from 'child_process';
+import execa from 'execa';
 
 const env = Object.assign({}, process.env, {
   HGPLAIN: 1,
@@ -32,55 +32,36 @@ const adapter: SCMAdapter = {
   findChangedFiles: async (
     cwd: string,
     options: Options,
-  ): Promise<Array<Path>> =>
-    new Promise((resolve, reject) => {
-      const includePaths: Array<Path> = (options && options.includePaths) || [];
+  ): Promise<Array<Path>> => {
+    const includePaths: Array<Path> = (options && options.includePaths) || [];
 
-      const args = ['status', '-amnu'];
-      if (options && options.withAncestor) {
-        args.push('--rev', `ancestor(${ANCESTORS.join(', ')})`);
-      } else if (options && options.changedSince) {
-        args.push('--rev', `ancestor(., ${options.changedSince})`);
-      } else if (options && options.lastCommit === true) {
-        args.push('-A');
-      }
-      args.push(...includePaths);
-      const child = childProcess.spawn('hg', args, {cwd, env});
-      let stdout = '';
-      let stderr = '';
-      child.stdout.on('data', data => (stdout += data));
-      child.stderr.on('data', data => (stderr += data));
-      child.on('error', (error: Error) => reject(error));
-      child.on('close', code => {
-        if (code === 0) {
-          stdout = stdout.trim();
-          if (stdout === '') {
-            resolve([]);
-          } else {
-            resolve(
-              stdout
-                .split('\n')
-                .map(changedPath => path.resolve(cwd, changedPath)),
-            );
-          }
-        } else {
-          reject(new Error(code + ': ' + stderr));
-        }
-      });
-    }),
+    const args = ['status', '-amnu'];
+    if (options && options.withAncestor) {
+      args.push('--rev', `ancestor(${ANCESTORS.join(', ')})`);
+    } else if (options && options.changedSince) {
+      args.push('--rev', `ancestor(., ${options.changedSince})`);
+    } else if (options && options.lastCommit === true) {
+      args.push('-A');
+    }
+    args.push(...includePaths);
 
-  getRoot: async (cwd: Path): Promise<?Path> =>
-    new Promise(resolve => {
-      try {
-        let stdout = '';
-        const child = childProcess.spawn('hg', ['root'], {cwd, env});
-        child.stdout.on('data', data => (stdout += data));
-        child.on('error', () => resolve(null));
-        child.on('close', code => resolve(code === 0 ? stdout.trim() : null));
-      } catch (e) {
-        resolve(null);
-      }
-    }),
+    const result = await execa('hg', args, {cwd, env});
+
+    return result.stdout
+      .split('\n')
+      .filter(s => s !== '')
+      .map(changedPath => path.resolve(cwd, changedPath));
+  },
+
+  getRoot: async (cwd: Path): Promise<?Path> => {
+    try {
+      const result = await execa('hg', ['root'], {cwd, env});
+
+      return result.stdout;
+    } catch (e) {
+      return null;
+    }
+  },
 };
 
 export default adapter;

yarn.lock

@@ -3929,7 +3929,7 @@ encoding@^0.1.11:
   dependencies:
     iconv-lite "~0.4.13"
 
-end-of-stream@^1.0.0:
+end-of-stream@^1.0.0, end-of-stream@^1.1.0:
   version "1.4.1"
   resolved "https://registry.yarnpkg.com/end-of-stream/-/end-of-stream-1.4.1.tgz#ed29634d19baba463b6ce6b80a37213eab71ec43"
   dependencies:
@@ -4404,6 +4404,18 @@ execa@^0.8.0:
     signal-exit "^3.0.0"
     strip-eof "^1.0.0"
 
+execa@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/execa/-/execa-1.0.0.tgz#c6236a5bb4df6d6f15e88e7f017798216749ddd8"
+  dependencies:
+    cross-spawn "^6.0.0"
+    get-stream "^4.0.0"
+    is-stream "^1.1.0"
+    npm-run-path "^2.0.0"
+    p-finally "^1.0.0"
+    signal-exit "^3.0.0"
+    strip-eof "^1.0.0"
+
 executable@^1.0.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/executable/-/executable-1.1.0.tgz#877980e9112f3391066da37265de7ad8434ab4d9"
@@ -5040,6 +5052,12 @@ get-stream@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/get-stream/-/get-stream-3.0.0.tgz#8e943d1358dc37555054ecbe2edb05aa174ede14"
 
+get-stream@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/get-stream/-/get-stream-4.0.0.tgz#9e074cb898bd2b9ebabb445a1766d7f43576d977"
+  dependencies:
+    pump "^3.0.0"
+
 get-uri@2:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/get-uri/-/get-uri-2.0.1.tgz#dbdcacacd8c608a38316869368117697a1631c59"
@@ -8119,7 +8137,7 @@ on-headers@~1.0.0, on-headers@~1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/on-headers/-/on-headers-1.0.1.tgz#928f5d0f470d49342651ea6794b0857c100693f7"
 
-once@^1.3.0, once@^1.4.0:
+once@^1.3.0, once@^1.3.1, once@^1.4.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/once/-/once-1.4.0.tgz#583b1aa775961d4b113ac17d9c50baef9dd76bd1"
   dependencies:
@@ -8909,6 +8927,13 @@ public-encrypt@^4.0.0:
     parse-asn1 "^5.0.0"
     randombytes "^2.0.1"
 
+pump@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/pump/-/pump-3.0.0.tgz#b4a2116815bde2f4e1ea602354e8c75565107a64"
+  dependencies:
+    end-of-stream "^1.1.0"
+    once "^1.3.1"
+
 [email protected]:
   version "1.3.2"
   resolved "https://registry.yarnpkg.com/punycode/-/punycode-1.3.2.tgz#9653a036fb7c1ee42342f2325cceefea3926c48d"