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docgen: Add support for assignment patterns #30681

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merged 1 commit into from Apr 12, 2021
Merged

docgen: Add support for assignment patterns #30681

merged 1 commit into from Apr 12, 2021

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@sarayourfriend
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@sarayourfriend sarayourfriend commented Apr 9, 2021 •
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Description

Adds support for assignment patterns to docgen's TS parsing. Fixes the last part of #29944

How has this been tested?

unit tests added and existing ones pass. No changes to existing docgen output.

Types of changes

New feature/bug fix (which is it?)

Checklist:

  • My code is tested.
  • My code follows the WordPress code style.
  • [N/A] My code follows the accessibility standards.
  • [N/A] I've tested my changes with keyboard and screen readers.
  • My code has proper inline documentation.
  • I've included developer documentation if appropriate.
  • I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).
@sarayourfriend sarayourfriend self-assigned this Apr 9, 2021
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Total Size: 1.43 MB

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noahtallen
noahtallen approved these changes Apr 9, 2021
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@noahtallen noahtallen left a comment

Nice cleanup! From what I gather, the main difference is that if we are parsing an assignment pattern, then we parse the "left" part of that?

What was the previous behavior?

packages/docgen/lib/get-type-annotation.js
@@ -426,7 +465,12 @@ function getParamTypeAnnotation( tag, declarationToken, paramIndex ) {
const isQualifiedName = tag.name.includes( '.' );

try {
if ( babelTypes.isAssignmentPattern( paramToken ) ) {
paramToken = paramToken.left;
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@noahtallen noahtallen Apr 9, 2021

What does paramToken.left represent?

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@sarayourfriend sarayourfriend Apr 10, 2021

paramToken.left represents the "regular" part of the assignment pattern. The assignment pattern is split along the = so:

function fn(foo: string = '') //...

Gets split like so:

left right
foo: string = ''

left could technically be any kind of pattern, whether an Identifier, a rest param, an array or object destructuring pattern:

function fn([foo]: string[] = []) //...

for example, left would be [foo]: string[].

@sarayourfriend
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@sarayourfriend sarayourfriend commented Apr 10, 2021

I should have split this into two separate commits, sorry about that.

There's the cleanup and then yes, the handling of the assignment pattern. The previous behavior is just that it would break completely and raise the error about not being able to find the parameter.

Base automatically changed from add/docgen-ts-object-destructuring to trunk Apr 12, 2021
@sarayourfriend
docgen: Add support for assignment patterns
2204fdf
@sarayourfriend sarayourfriend force-pushed the add/docgen-ts-assignment-pattern branch from e1a0134 to 2204fdf Apr 12, 2021
@sarayourfriend sarayourfriend merged commit bbfb7c3 into trunk Apr 12, 2021
20 checks passed
@sarayourfriend sarayourfriend deleted the add/docgen-ts-assignment-pattern branch Apr 12, 2021
@github-actions github-actions bot added this to the Gutenberg 10.5 milestone Apr 12, 2021
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