Bump esbuild from 0.14.48 to 0.14.49

[dependabot]

Bumps esbuild from 0.14.48 to 0.14.49.

Release notes

Sourced from esbuild's releases.

v0.14.49

• Keep inlined constants when direct eval is present (#2361)

  Version 0.14.19 of esbuild added inlining of certain const variables during minification, which replaces all references to the variable with the initializer and then removes the variable declaration. However, this could generate incorrect code when direct eval is present because the direct eval could reference the constant by name. This release fixes the problem by preserving the const variable declaration in this case:

  // Original code
  console.log((() => { const x = 123; return x + eval('x') }))
  // Old output (with --minify)
  console.log(()=>123+eval("x"));
  // New output (with --minify)
  console.log(()=>{const x=123;return 123+eval("x")});

• Fix an incorrect error in TypeScript when targeting ES5 (#2375)

  Previously when compiling TypeScript code to ES5, esbuild could incorrectly consider the following syntax forms as a transformation error:

  0 ? ([]) : 1 ? ({}) : 2;

  The error messages looked like this:

  ✘ [ERROR] Transforming destructuring to the configured target environment ("es5") is not supported yet
  example.ts:1:5:
    1 │ 0 ? ([]) : 1 ? ({}) : 2;
      ╵      ^
  
  ✘ [ERROR] Transforming destructuring to the configured target environment ("es5") is not supported yet
  example.ts:1:16:
    1 │ 0 ? ([]) : 1 ? ({}) : 2;
      ╵                 ^
  
  

  These parenthesized literals followed by a colon look like the start of an arrow function expression followed by a TypeScript return type (e.g. ([]) : 1 could be the start of the TypeScript arrow function ([]): 1 => 1). Unlike in JavaScript, parsing arrow functions in TypeScript requires backtracking. In this case esbuild correctly determined that this expression wasn't an arrow function after all but the check for destructuring was incorrectly not covered under the backtracking process. With this release, the error message is now only reported if the parser successfully parses an arrow function without backtracking.

• Fix generated TypeScript enum comments containing */ (#2369, #2371)

  TypeScript enum values that are equal to a number or string literal are inlined (references to the enum are replaced with the literal value) and have a /* ... */ comment after them with the original enum name to improve readability. However, this comment is omitted if the enum name contains the character sequence */ because that would end the comment early and cause a syntax error:

  // Original TypeScript
  enum Foo { '/*' = 1, '*/' = 2 }
  console.log(Foo['/*'], Foo['*/'])

... (truncated)

Changelog

Sourced from esbuild's changelog.

0.14.49

• Keep inlined constants when direct eval is present (#2361)

  Version 0.14.19 of esbuild added inlining of certain const variables during minification, which replaces all references to the variable with the initializer and then removes the variable declaration. However, this could generate incorrect code when direct eval is present because the direct eval could reference the constant by name. This release fixes the problem by preserving the const variable declaration in this case:

  // Original code
  console.log((() => { const x = 123; return x + eval('x') }))
  // Old output (with --minify)
  console.log(()=>123+eval("x"));
  // New output (with --minify)
  console.log(()=>{const x=123;return 123+eval("x")});

• Fix an incorrect error in TypeScript when targeting ES5 (#2375)

  Previously when compiling TypeScript code to ES5, esbuild could incorrectly consider the following syntax forms as a transformation error:

  0 ? ([]) : 1 ? ({}) : 2;

  The error messages looked like this:

  ✘ [ERROR] Transforming destructuring to the configured target environment ("es5") is not supported yet
  example.ts:1:5:
    1 │ 0 ? ([]) : 1 ? ({}) : 2;
      ╵      ^
  
  ✘ [ERROR] Transforming destructuring to the configured target environment ("es5") is not supported yet
  example.ts:1:16:
    1 │ 0 ? ([]) : 1 ? ({}) : 2;
      ╵                 ^
  
  

  These parenthesized literals followed by a colon look like the start of an arrow function expression followed by a TypeScript return type (e.g. ([]) : 1 could be the start of the TypeScript arrow function ([]): 1 => 1). Unlike in JavaScript, parsing arrow functions in TypeScript requires backtracking. In this case esbuild correctly determined that this expression wasn't an arrow function after all but the check for destructuring was incorrectly not covered under the backtracking process. With this release, the error message is now only reported if the parser successfully parses an arrow function without backtracking.

• Fix generated TypeScript enum comments containing */ (#2369, #2371)

  TypeScript enum values that are equal to a number or string literal are inlined (references to the enum are replaced with the literal value) and have a /* ... */ comment after them with the original enum name to improve readability. However, this comment is omitted if the enum name contains the character sequence */ because that would end the comment early and cause a syntax error:

  // Original TypeScript
  enum Foo { '/*' = 1, '*/' = 2 }

... (truncated)

Commits

• 3b6b964 publish 0.14.49 to npm
• 04b6572 fix #2361: keeps inlined const for direct eval
• 4aa1868 Fix documentation link (#2376)
• 147163e #2380: allow declare class field initializers
• a2789bf fix #2375: avoid bad es5 error when backtracking
• 580ad40 experiment with equality operand orderings (#2364)
• ffbc5c2 remove canonicalization of equality order
• 4a00ba9 improve printed diffs in tests
• 18ef7be fix #2365, close #2372: bug in compat-table code
• 8b5e048 follow-up to #2371
• Additional commits viewable in compare view

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