814891057

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Pull Request Pull Request #1: feat: Initial implementation

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87.93

/projects/core/index.ts

import type {FilterPattern} from '@rollup/pluginutils';
import {createFilter} from '@rollup/pluginutils';
import type {SimpleLiteral} from 'estree';
import type {BaseNode} from 'estree-walker';
import {asyncWalk} from 'estree-walker';
import MagicString from 'magic-string';
import {basename, dirname, extname, join} from 'path';
import type {AcornNode, Plugin, TransformResult} from 'rollup';
import {AssetLoader} from './AssetLoader';

const enum Strings {
  ImportName = '__wasmBindgenRollupPluginDynamicImportLoader'
}

const enum AstTypes {
  ImportExpression = 'ImportExpression',
  Literal = 'Literal'
}

function resolveWasmFile(id: string): [string, string] {
  const base = basename(id, extname(id));
  const wasmName = `${base}_bg.wasm`;

  return [wasmName, join(dirname(id), wasmName)];
}

/** Standard Rollup filter */
interface Filter {
  exclude?: FilterPattern;

  include?: FilterPattern;
}

interface Opts {

  /**
   * JS source files to look for dynamic imports in.
   * @default {include: /\.[jt]sx?$/}
   */
  jsFilter?: Filter;

  /**
   * Whether to include a source map in the generated code
   * @default true
   */
  sourceMap?: boolean;

  /**
   * Filter to match dynamically imported wasm-bindgen output files
   * @default Don't match anything
   */
  wasmFilter?: Filter;
}

function wasmBindgenPlugin(opts: Opts): Plugin { // eslint-disable-line max-lines-per-function
  const {
    jsFilter = {
      include: /\.[jt]sx?$/
    },
    sourceMap = true,
    wasmFilter
  } = opts;

  const matchesWasm = createFilter(wasmFilter?.include, wasmFilter?.exclude);
  const matchesJs = createFilter(jsFilter.include, jsFilter.exclude);
  const wasmLoader = new AssetLoader();
  const returnTransformResult: (ms: MagicString) => TransformResult = sourceMap ?
    (ms => ({code: ms.toString(), map: ms.generateMap()})) :
    (ms => ({code: ms.toString(), map: {mappings: ''}}));

  return {
    name: 'rollup-plugin-wasm-bindgen-web',
    async transform(code, id) {
      if (!matchesJs(id)) {
        return null;
      }

      const ctx = this; // eslint-disable-line @typescript-eslint/no-this-alias
      const importExpressions: Array<{ id: string; node: any; }> = [];
      const ast = this.parse(code);

      // Find dynamic imports for our wasm modules
      await asyncWalk(ast as unknown as BaseNode, {
        async enter(node: any) { // typings don't have import expressions..
          if (
            node.type !== AstTypes.ImportExpression ||
            node.source?.type !== AstTypes.Literal
          ) {
            return;
          }

          const source = node.source as SimpleLiteral & AcornNode;
          const importedId = (await ctx.resolve(source.value as string, id))?.id;
          if (!importedId || !matchesWasm(importedId)) {
            return;
          }

          importExpressions.push({id: importedId, node});
        }
      });

      if (!importExpressions.length) {
        return {ast, code, map: null};
      }

      const ms = new MagicString(code);

      // Emit a wasm asset and format each dynamic import
      await Promise.all(
        importExpressions.map(async ({id: wasmBridgeId, node}) => {
          const [name, wasmPath] = resolveWasmFile(wasmBridgeId);
          const source = await wasmLoader.load(wasmPath);
          const assetId = this.emitFile({
            name,
            source,
            type: 'asset'
          });
          ms.prependLeft(node.start, `${Strings.ImportName}(\n`);
          ms.appendRight(node.end, `,\nimport.meta.ROLLUP_FILE_URL_${assetId}\n)`);
        })
      );

      ms.prepend(`import ${Strings.ImportName} from '@alorel/rollup-plugin-wasm-bindgen-web/autoinit-wasm-import';\n`);

      return returnTransformResult(ms);
    },
    watchChange(id) {
      wasmLoader.invalidate(id);
    }
  };
}

export {
  Opts,
  wasmBindgenPlugin as wasmBindgen
};

1	import type {FilterPattern} from '@rollup/pluginutils';
2	import {createFilter} from '@rollup/pluginutils';	2✔
3	import type {SimpleLiteral} from 'estree';
4	import type {BaseNode} from 'estree-walker';
5	import {asyncWalk} from 'estree-walker';	2✔
6	import MagicString from 'magic-string';	2✔
7	import {basename, dirname, extname, join} from 'path';	2✔
8	import type {AcornNode, Plugin, TransformResult} from 'rollup';
9	import {AssetLoader} from './AssetLoader';	2✔
10
11	const enum Strings {
12	ImportName = '__wasmBindgenRollupPluginDynamicImportLoader'
13	}
14
15	const enum AstTypes {
16	ImportExpression = 'ImportExpression',
17	Literal = 'Literal'
18	}
19
20	function resolveWasmFile(id: string): [string, string] {
21	const base = basename(id, extname(id));	2✔
22	const wasmName = `${base}_bg.wasm`;	2✔
23
24	return [wasmName, join(dirname(id), wasmName)];	2✔
25	}
26
27	/** Standard Rollup filter */
28	interface Filter {
29	exclude?: FilterPattern;
30
31	include?: FilterPattern;
32	}
33
34	interface Opts {
35
36	/**
37	* JS source files to look for dynamic imports in.
38	* @default {include: /\.[jt]sx?$/}
39	*/
40	jsFilter?: Filter;
41
42	/**
43	* Whether to include a source map in the generated code
44	* @default true
45	*/
46	sourceMap?: boolean;
47
48	/**
49	* Filter to match dynamically imported wasm-bindgen output files
50	* @default Don't match anything
51	*/
52	wasmFilter?: Filter;
53	}
54
55	function wasmBindgenPlugin(opts: Opts): Plugin { // eslint-disable-line max-lines-per-function
56	const {
57	jsFilter = {	2✔
58	include: /\.[jt]sx?$/
59	},
60	sourceMap = true,	2✔
61	wasmFilter
62	} = opts;	2✔
63
64	const matchesWasm = createFilter(wasmFilter?.include, wasmFilter?.exclude);	2✔
65	const matchesJs = createFilter(jsFilter.include, jsFilter.exclude);	2✔
66	const wasmLoader = new AssetLoader();	2✔
67	const returnTransformResult: (ms: MagicString) => TransformResult = sourceMap ?	2✔
68	(ms => ({code: ms.toString(), map: ms.generateMap()})) :	2!
NEW 69	(ms => ({code: ms.toString(), map: {mappings: ''}}));	×
70
71	return {	2✔
72	name: 'rollup-plugin-wasm-bindgen-web',
73	async transform(code, id) {
74	if (!matchesJs(id)) {	4!
NEW 75	return null;	×
76	}
77
78	const ctx = this; // eslint-disable-line @typescript-eslint/no-this-alias	4✔
79	const importExpressions: Array<{ id: string; node: any; }> = [];	4✔
80	const ast = this.parse(code);	4✔
81
82	// Find dynamic imports for our wasm modules
83	await asyncWalk(ast as unknown as BaseNode, {	4✔
84	async enter(node: any) { // typings don't have import expressions..
85	if (	472✔
86	node.type !== AstTypes.ImportExpression \|\|	474✔
87	node.source?.type !== AstTypes.Literal
88	) {
89	return;	470✔
90	}
91
92	const source = node.source as SimpleLiteral & AcornNode;	2✔
93	const importedId = (await ctx.resolve(source.value as string, id))?.id;	2✔
94	if (!importedId \|\| !matchesWasm(importedId)) {	2!
NEW 95	return;	×
96	}
97
98	importExpressions.push({id: importedId, node});	2✔
99	}
100	});
101
102	if (!importExpressions.length) {	4✔
103	return {ast, code, map: null};	2✔
104	}
105
106	const ms = new MagicString(code);	2✔
107
108	// Emit a wasm asset and format each dynamic import
109	await Promise.all(	2✔
110	importExpressions.map(async ({id: wasmBridgeId, node}) => {
111	const [name, wasmPath] = resolveWasmFile(wasmBridgeId);	2✔
112	const source = await wasmLoader.load(wasmPath);	2✔
113	const assetId = this.emitFile({	2✔
114	name,
115	source,
116	type: 'asset'
117	});
118	ms.prependLeft(node.start, `${Strings.ImportName}(\n`);	2✔
119	ms.appendRight(node.end, `,\nimport.meta.ROLLUP_FILE_URL_${assetId}\n)`);	2✔
120	})
121	);
122
123	ms.prepend(`import ${Strings.ImportName} from '@alorel/rollup-plugin-wasm-bindgen-web/autoinit-wasm-import';\n`);	2✔
124
125	return returnTransformResult(ms);	2✔
126	},
127	watchChange(id) {
NEW 128	wasmLoader.invalidate(id);	×
129	}
130	};
131	}
132
133	export {
134	Opts,
135	wasmBindgenPlugin as wasmBindgen	2✔
136	};

Alorel / rollup-plugin-wasm-bindgen-web / 814891057

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