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Storybook: Add webpack loader for easier story descriptions (#39165)
* Storybook: Add webpack loader for story descriptions * Convert story descriptions for FontSizePicker
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| /** | ||
| * Allows a story description to be written as a doc comment above the exported story. | ||
| * | ||
| * Based on https://github.com/izhan/storybook-description-loader | ||
| * | ||
| * @example | ||
| * ```jsx | ||
| * // This comment will become the description for the story in the generated docs. | ||
| * export const MyStory = Template.bind({}); | ||
| * ``` | ||
| */ | ||
|
|
||
| /** | ||
| * External dependencies | ||
| */ | ||
| const babel = require( '@babel/core' ); | ||
|
|
||
| function createDescriptionNode( name, description ) { | ||
| return babel.types.expressionStatement( | ||
| babel.types.assignmentExpression( | ||
| '=', | ||
| babel.types.memberExpression( | ||
| babel.types.identifier( name ), | ||
| babel.types.identifier( 'story' ) | ||
| ), | ||
| babel.types.objectExpression( [ | ||
| babel.types.objectProperty( | ||
| babel.types.identifier( 'parameters' ), | ||
| babel.types.objectExpression( [ | ||
| babel.types.objectProperty( | ||
| babel.types.identifier( 'docs' ), | ||
| babel.types.objectExpression( [ | ||
| babel.types.objectProperty( | ||
| babel.types.identifier( | ||
| 'storyDescription' | ||
| ), | ||
| babel.types.stringLiteral( description ) | ||
| ), | ||
| ] ) | ||
| ), | ||
| ] ) | ||
| ), | ||
| ] ) | ||
| ) | ||
| ); | ||
| } | ||
|
|
||
| function annotateDescriptionPlugin() { | ||
| return { | ||
| visitor: { | ||
| ExportNamedDeclaration( path ) { | ||
| if ( path.node.leadingComments ) { | ||
| const commentValues = path.node.leadingComments.map( | ||
| ( node ) => { | ||
| if ( node.type === 'CommentLine' ) { | ||
| return node.value.trimLeft(); | ||
| } | ||
| // else, node.type === 'CommentBlock' | ||
| return node.value | ||
| .split( '\n' ) | ||
| .map( ( line ) => { | ||
| // stripping out the whitespace and * from comment blocks | ||
| return line.replace( | ||
| /^(\s+)?(\*+)?(\s+)?/, | ||
| '' | ||
| ); | ||
| } ) | ||
| .join( '\n' ) | ||
| .trim(); | ||
| } | ||
| ); | ||
| const description = commentValues.join( '\n' ); | ||
| const declaration = path.node.declaration.declarations[ 0 ]; | ||
|
|
||
| path.insertAfter( | ||
| createDescriptionNode( | ||
| declaration.id.name, | ||
| description | ||
| ) | ||
| ); | ||
| } | ||
| }, | ||
| }, | ||
| }; | ||
| } | ||
|
|
||
| module.exports = function ( source ) { | ||
| const output = babel.transform( source, { | ||
| plugins: [ annotateDescriptionPlugin ], | ||
| filename: __filename, | ||
| sourceType: 'module', | ||
| } ); | ||
| return output.code; | ||
| }; |