Port babel-parser changes from 2019-09-06 to 2019-12-22

[alangpierce]

Fixes #483

cbd5a26e5 v7.6.0
🚫 Release only.

daf25af47 Fix typo in changelog (#10409)
🚫 Docs only.

4395c22f3 Miscellaneous perf tweak (#10421)
✅ Ported one small optimization.

cb881e6b3 [parser] Report escapes in kws only if they won't be used as i… (#10455)
🚫 Not relevant for Sucrase since Sucrase doesn't do validation.

9c1ad0a9f [parser] Disallow static fields named constructor (#10461)
🚫 Validation-only change.

b7333ea97 added check to disallow super.private variable access and test case added (#10472)
🚫 Validation-only change.

3069747a8 Leave trailing comments after handling a possible trailing com… (#10445)
🚫 Only affects comments, which aren't relevant for Sucrase.

f339d2d03 [parser] Disallow numeric separator in unicode scape sequences (#10468)
🚫 Validation only.

69d00dc5b [parser] Invalid NonOctal Decimal (#10467)
🚫 Validation only.

b9cb4af95 v7.6.2
🚫 Release only.

6f3460c76 chore: add access: public to babel parser publish config (#10487)
🚫 package.json only.

0e9502685 [parser] Don't crash on comment after trailing comma after eli… (#10490)
✅ Was already working, but I added a test anyway.

490798a26 [parser] Disallow numeric separators in legacy octal like inte… (#10493)
🚫 Validation only.

80d99b4d4 Do not allow member expressions to start async arrows (#10332)
🚫 Doesn't appear to affect current Sucrase code.

fa5057f9f Flow: interface identifier should be declared in the scope (#10220)
🚫 Scope-only change.

a219b6de7 Disallow await inside async arrow params (#10469)
🚫 Validation only, not relevant for Sucrase.

0856618ed perf: replace lookahead by lookaheadCharCode (#10371)
🚫 I'll hold off on this for now, but seems good to explore at some point.

b0acfb24d add scope to TSModuleDeclaration (#10119)
🚫 Scope only.

d329156eb v7.6.3
🚫 Release only.

34937f13d Trailing comma after rest - The final fix (#10491)
🚫 Looks like this is only for validation, so doesn't affect Sucrase.

a422ea64e v7.6.4
🚫 Release only.

06313a628 Allow duplicate proto keys in patterns, simple case (#6705) (#10532)
🚫 Validation only.

5800fc97b [parser] Exception to 8 and 9 in tagged template (#10567)
🚫 Validation only.

095f28a91 fix: Exclude catch clause from let identifier error (#10559)
🚫 Doesn't apply to strict mode, Sucrase is always strict mode.

78cd63d9c Fix invalid test layout in @babel/parser
🚫 Test only.

b6ef9689b [parser] Parse only modifiers of actual methods (#10594)
🚫 Validation only.

1d1fab4ea [parser] Add support for private fields in TypeScript (#10483)
✅ Already seems to be working (aside from validation), and I added a test.

4cd93ab5f [parser] Enable "exportNamespaceFrom" by default (#10521)
🚫 Already enabled in Sucrase.

38a306311 add assertions signature for TypeScript (#10543)
✅ Implemented separately in Sucrase.

63f9a3c94 rename assertsModifier to asserts (#10613)
🚫 AST-only change.

143d15998 Create parser plugin "topLevelAwait" (#10449)
🚫 Sucrase already supports top-level await, and the ambiguities don't apply
since Sucrase assumes module code where await is reserved.

4b3a19ea9 fixed missing errors on assignment pattern in object expression (#10607)
🚫 Validation only.

ec3345bb5 Flow enums parsing (#10344)
🚫 For now I won't support Flow enums since it looks like the runtime semantics
aren't figured out yet.

d023e105b [TS] Parse calls with type args in optional chains (#10631)
✅ This seems to already work, and I added a test.

87feda7c2 @babel/parser error recovery (#10363)
🚫 Big restructure, but I think doesn't have an effect on Sucrase since Sucrase
isn't interested in reporting detailed errors.

e9c1bce50 Add support for TS declare modifier on fields (#10545)
🚫 Filed #486 to track this issue.

97faa8395 v7.7.0
🚫 Release only.

2cd5ad0c8 fix typo: identifer -> identifier (#10647)
🚫 Docs only.

9082e68d6 Parse arrows with params annotations in conditional expressions (#10669)
🚫 Parsing edge case that shouldn't affect emit anyway, and the parsing code
works differently now in Sucrase.

35f4d1276 v7.7.2
🚫 Release only.

0287c0f02 Don't recover from "adjacent jsx elements" parser error (#10682)
🚫 Error recovery not relevant for Sucrase.

e315d65a7 v7.7.3
🚫 Release only.

4cb5e0a01 Allow TypeScript type assertions in array destructuring (#10592)
🚫 Already works in Sucrase.

d413a3078 Add asserts this [is type] parsing support (#10677)
✅ Implemented in a simpler way in Sucrase.

a6d134804 Unify build step for ESLint packages (#10723)
🚫 Test only.

cfd26fdbf register ImportEqualsSpecifier to scope (#10710)
🚫 Scope code not relevant to Sucrase.

10213655b [parser] Allow optional async methods (#10582)
✅ Same bug fix applied.

a502d8804 Fix some incorrect typeof parsing in flow (#10657)
🚫 Doesn't seem to affect Sucrase.

01d6d6dd3 Flow enums: fix enum body location (#10737)
🚫 Not supporting flow enums yet.

75767d87c v7.7.4
🚫 Release only.

5440ae1ca Correctly disambiguate / after async fuctions (#10475)
🚫 Fix wouldn't apply to Sucrase, and seems obscure enough to ignore and likely
wouldn't affect Sucrase output anyway.

d18afbd7c Allow tuple rest trailing comma (#10800)
✅ Already works in Sucrase, and I added a test.

bb6cc6197 fix(optional chaining): Optional delete returns true with nullish base (#10806)
🚫 Test only.

c6e966cac [parser] Use scope flags to check arguments (#10801)
🚫 Validation only.

d04508e51 v7.7.5
🚫 Release only.

fb100eee4 @babel/eslint-parser: fix BigIntLiteral node to match ESTree spec (#10827)
🚫 Sucrase doesn't support ESTree parsing.

20e43ad10 validate parentheses in the left-hand side of assignment expressions (#10576)
🚫 Validation only.

5156d3ea0 Restore @babel/parser tests (#10854)
🚫 Test only.

7b54a9438 @babel/eslint-parser: fix ImportExpression node to match ESTree spec (#10828)
🚫 Sucrase doesn't support ESTree parsing.

0b3f883ed Properly serialize non-json values in parser tests (#10858)
🚫 Test only.

12da0941c v7.7.7
🚫 Release only.

f651f22f9 fix: lost leading comment after named import (#10901)
🚫 Doesn't affect Sucrase.

[codecov-io]

Codecov Report

Merging #487 into master will increase coverage by 0.3%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #487     +/-   ##
=========================================
+ Coverage   81.82%   82.13%   +0.3%     
=========================================
  Files          52       52             
  Lines        5421     5431     +10     
  Branches     1206     1210      +4     
=========================================
+ Hits         4436     4461     +25     
+ Misses        695      682     -13     
+ Partials      290      288      -2

Impacted Files	Coverage Δ
src/parser/tokenizer/readWordTree.ts	100% <ø> (ø)	⬆️
src/parser/tokenizer/index.ts	76.58% <100%> (+1.34%)	⬆️
src/parser/tokenizer/keywords.ts	100% <100%> (ø)	⬆️
src/parser/plugins/typescript.ts	80.36% <100%> (+0.25%)	⬆️
src/parser/traverser/statement.ts	83% <100%> (+0.91%)	⬆️
src/parser/traverser/expression.ts	85.71% <0%> (+0.65%)	⬆️
src/parser/traverser/lval.ts	98.79% <0%> (+1.2%)	⬆️

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