build(deps-dev): bump esbuild from 0.15.6 to 0.15.15

[dependabot]

Bumps esbuild from 0.15.6 to 0.15.15.

Release notes

Sourced from esbuild's releases.

v0.15.15

• Remove duplicate CSS rules across files (#2688)

  When two or more CSS rules are exactly the same (even if they are not adjacent), all but the last one can safely be removed:

  /* Before */
  a { color: red; }
  span { font-weight: bold; }
  a { color: red; }
  /* After */
  span { font-weight: bold; }
  a { color: red; }

  Previously esbuild only did this transformation within a single source file. But with this release, esbuild will now do this transformation across source files, which may lead to smaller CSS output if the same rules are repeated across multiple CSS source files in the same bundle. This transformation is only enabled when minifying (specifically when syntax minification is enabled).

• Add deno as a valid value for target (#2686)

  The target setting in esbuild allows you to enable or disable JavaScript syntax features for a given version of a set of target JavaScript VMs. Previously Deno was not one of the JavaScript VMs that esbuild supported with target, but it will now be supported starting from this release. For example, versions of Deno older than v1.2 don't support the new ||= operator, so adding e.g. --target=deno1.0 to esbuild now lets you tell esbuild to transpile ||= to older JavaScript.

• Fix the esbuild-wasm package in Node v19 (#2683)

  A recent change to Node v19 added a non-writable crypto property to the global object: nodejs/node#44897. This conflicts with Go's WebAssembly shim code, which overwrites the global crypto property. As a result, all Go-based WebAssembly code that uses the built-in shim (including esbuild) is now broken on Node v19. This release of esbuild fixes the issue by reconfiguring the global crypto property to be writable before invoking Go's WebAssembly shim code.

• Fix CSS dimension printing exponent confusion edge case (#2677)

  In CSS, a dimension token has a numeric "value" part and an identifier "unit" part. For example, the dimension token 32px has a value of 32 and a unit of px. The unit can be any valid CSS identifier. The value can be any number in floating-point format including an optional exponent (e.g. -3.14e-0 has an exponent of e-0). The full details of this syntax are here: https://www.w3.org/TR/css-syntax-3/.

  To maintain the integrity of the dimension token through the printing process, esbuild must handle the edge case where the unit looks like an exponent. One such case is the dimension 1e\32 which has the value 1 and the unit e2. It would be bad if this dimension token was printed such that a CSS parser would parse it as a number token with the value 1e2 instead of a dimension token. The way esbuild currently does this is to escape the leading e in the dimension unit, so esbuild would parse 1e\32 but print 1\65 2 (both 1e\32 and 1\65 2 represent a dimension token with a value of 1 and a unit of e2).

  However, there is an even narrower edge case regarding this edge case. If the value part of the dimension token itself has an e, then it's not necessary to escape the e in the dimension unit because a CSS parser won't confuse the unit with the exponent even though it looks like one (since a number can only have at most one exponent). This came up because the grammar for the CSS unicode-range property uses a hack that lets you specify a hexadecimal range without quotes even though CSS has no token for a hexadecimal range. The hack is to allow the hexadecimal range to be parsed as a dimension token and optionally also a number token. Here is the grammar for unicode-range:

  unicode-range =
    <urange>#
  <urange> =
  u '+' <ident-token> '?'*            |
  u <dimension-token> '?'*            |
  u <number-token> '?'*               |
  u <number-token> <dimension-token>  |
  u <number-token> <number-token>     |
  u '+' '?'+
  

  and here is an example unicode-range declaration that was problematic for esbuild:

... (truncated)

Changelog

Sourced from esbuild's changelog.

0.15.15

• Remove duplicate CSS rules across files (#2688)

  When two or more CSS rules are exactly the same (even if they are not adjacent), all but the last one can safely be removed:

  /* Before */
  a { color: red; }
  span { font-weight: bold; }
  a { color: red; }
  /* After */
  span { font-weight: bold; }
  a { color: red; }

  Previously esbuild only did this transformation within a single source file. But with this release, esbuild will now do this transformation across source files, which may lead to smaller CSS output if the same rules are repeated across multiple CSS source files in the same bundle. This transformation is only enabled when minifying (specifically when syntax minification is enabled).

• Add deno as a valid value for target (#2686)

  The target setting in esbuild allows you to enable or disable JavaScript syntax features for a given version of a set of target JavaScript VMs. Previously Deno was not one of the JavaScript VMs that esbuild supported with target, but it will now be supported starting from this release. For example, versions of Deno older than v1.2 don't support the new ||= operator, so adding e.g. --target=deno1.0 to esbuild now lets you tell esbuild to transpile ||= to older JavaScript.

• Fix the esbuild-wasm package in Node v19 (#2683)

  A recent change to Node v19 added a non-writable crypto property to the global object: nodejs/node#44897. This conflicts with Go's WebAssembly shim code, which overwrites the global crypto property. As a result, all Go-based WebAssembly code that uses the built-in shim (including esbuild) is now broken on Node v19. This release of esbuild fixes the issue by reconfiguring the global crypto property to be writable before invoking Go's WebAssembly shim code.

• Fix CSS dimension printing exponent confusion edge case (#2677)

  In CSS, a dimension token has a numeric "value" part and an identifier "unit" part. For example, the dimension token 32px has a value of 32 and a unit of px. The unit can be any valid CSS identifier. The value can be any number in floating-point format including an optional exponent (e.g. -3.14e-0 has an exponent of e-0). The full details of this syntax are here: https://www.w3.org/TR/css-syntax-3/.

  To maintain the integrity of the dimension token through the printing process, esbuild must handle the edge case where the unit looks like an exponent. One such case is the dimension 1e\32 which has the value 1 and the unit e2. It would be bad if this dimension token was printed such that a CSS parser would parse it as a number token with the value 1e2 instead of a dimension token. The way esbuild currently does this is to escape the leading e in the dimension unit, so esbuild would parse 1e\32 but print 1\65 2 (both 1e\32 and 1\65 2 represent a dimension token with a value of 1 and a unit of e2).

  However, there is an even narrower edge case regarding this edge case. If the value part of the dimension token itself has an e, then it's not necessary to escape the e in the dimension unit because a CSS parser won't confuse the unit with the exponent even though it looks like one (since a number can only have at most one exponent). This came up because the grammar for the CSS unicode-range property uses a hack that lets you specify a hexadecimal range without quotes even though CSS has no token for a hexadecimal range. The hack is to allow the hexadecimal range to be parsed as a dimension token and optionally also a number token. Here is the grammar for unicode-range:

  unicode-range =
    <urange>#
  <urange> =
  u '+' <ident-token> '?'*            |
  u <dimension-token> '?'*            |
  u <number-token> '?'*               |
  u <number-token> <dimension-token>  |
  u <number-token> <number-token>     |
  u '+' '?'+
  

  and here is an example unicode-range declaration that was problematic for esbuild:

... (truncated)

Commits

• 478062d publish 0.15.15 to npm
• e7ad5fb remove duplicate css rules across files (#2688)
• 6664172 test duplicate rule merging after bundling
• a73c4e9 css: merge adjacent selectors forward not backward
• 4b1200f fix #2685: preferUnplugged: true in all packages
• ec9c3cf fix #2686: make deno a valid value for target
• 38c9c1f rewrite browser tests to work without runner
• d0fd268 upgrade puppeteer 5.5.0 => 19.2.2
• daccf02 fix #2683: esbuild-wasm broken in node v19
• ecc9eeb fix #2677: token unit escaping and unicode-range
• Additional commits viewable in compare view

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[dependabot]

Superseded by #38.