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Merge pull request #195 from theKashey/improve-prefetching
refine babel/webpack integration
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,177 @@ | ||
| // @ts-ignore | ||
| import * as crc32 from 'crc-32'; | ||
| import { existsSync } from 'fs'; | ||
| import { dirname, join, relative, resolve } from 'path'; | ||
|
|
||
| import { ImportedConfiguration } from '../configuration/configuration'; | ||
| import { processComment } from './magic-comments'; | ||
|
|
||
| export const encipherImport = (str: string) => { | ||
| return crc32.str(str).toString(32); | ||
| }; | ||
|
|
||
| // Babel v7 compat | ||
| let syntax: any; | ||
| try { | ||
| syntax = require('babel-plugin-syntax-dynamic-import'); | ||
| } catch (err) { | ||
| try { | ||
| syntax = require('@babel/plugin-syntax-dynamic-import'); | ||
| } catch (e) { | ||
| throw new Error( | ||
| 'react-imported-component babel plugin is requiring `babel-plugin-syntax-dynamic-import` or `@babel/plugin-syntax-dynamic-import` to work. Please add this dependency.' | ||
| ); | ||
| } | ||
| } | ||
| syntax = syntax.default || syntax; | ||
|
|
||
| const resolveImport = (importName: string, file = '') => { | ||
| if (importName.charAt(0) === '.') { | ||
| return relative(process.cwd(), resolve(dirname(file), importName)); | ||
| } | ||
| return importName; | ||
| }; | ||
|
|
||
| const templateOptions = { | ||
| placeholderPattern: /^([A-Z0-9]+)([A-Z0-9_]+)$/, | ||
| }; | ||
|
|
||
| function getImportArg(callPath: any) { | ||
| return callPath.get('arguments.0'); | ||
| } | ||
|
|
||
| function getComments(callPath: any) { | ||
| return callPath.has('leadingComments') ? callPath.get('leadingComments') : []; | ||
| } | ||
|
|
||
| // load configuration | ||
| const configurationFile = join(process.cwd(), '.imported.js'); | ||
| const defaultConfiguration: ImportedConfiguration = (existsSync(configurationFile) | ||
| ? require(configurationFile) | ||
| : {}) as ImportedConfiguration; | ||
|
|
||
| export const createTransformer = ( | ||
| { types: t, template }: any, | ||
| excludeMacro = false, | ||
| configuration = defaultConfiguration | ||
| ) => { | ||
| const headerTemplate = template( | ||
| `var importedWrapper = require('react-imported-component/wrapper');`, | ||
| templateOptions | ||
| ); | ||
|
|
||
| const importRegistration = template('importedWrapper(MARK, IMPORT)', templateOptions); | ||
|
|
||
| const hasImports = new Set<string>(); | ||
| const visitedNodes = new Map(); | ||
|
|
||
| return { | ||
| traverse(programPath: any, fileName: string) { | ||
| let isBootstrapFile = false; | ||
|
|
||
| programPath.traverse({ | ||
| ImportDeclaration(path: any) { | ||
| if (excludeMacro) { | ||
| return; | ||
| } | ||
|
|
||
| const source = path.node.source.value; | ||
| if (source === 'react-imported-component/macro') { | ||
| const { specifiers } = path.node; | ||
| path.remove(); | ||
| const assignName = 'assignImportedComponents'; | ||
| if (specifiers.length === 1 && specifiers[0].imported.name === assignName) { | ||
| isBootstrapFile = true; | ||
| programPath.node.body.unshift( | ||
| t.importDeclaration( | ||
| [t.importSpecifier(t.identifier(assignName), t.identifier(assignName))], | ||
| t.stringLiteral('react-imported-component/boot') | ||
| ) | ||
| ); | ||
| } else { | ||
| programPath.node.body.unshift( | ||
| t.importDeclaration( | ||
| specifiers.map((spec: any) => | ||
| t.importSpecifier(t.identifier(spec.imported.name), t.identifier(spec.imported.name)) | ||
| ), | ||
| t.stringLiteral('react-imported-component') | ||
| ) | ||
| ); | ||
| } | ||
| } | ||
| }, | ||
| Import({ parentPath }: any) { | ||
| if (visitedNodes.has(parentPath.node)) { | ||
| return; | ||
| } | ||
|
|
||
| const newImport = parentPath.node; | ||
| const rawImport = getImportArg(parentPath); | ||
| const importName = rawImport.node.value; | ||
| const rawComments = getComments(rawImport); | ||
| const comments = rawComments.map((parent: any) => parent.node.value); | ||
|
|
||
| const newComments = processComment(configuration, comments, importName, fileName, { | ||
| isBootstrapFile, | ||
| }); | ||
|
|
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| if (newComments !== comments) { | ||
| rawComments.forEach((comment: any) => comment.remove()); | ||
| newComments.forEach((comment: string) => { | ||
| rawImport.addComment('leading', ` ${comment} `); | ||
| }); | ||
| } | ||
|
|
||
| if (!importName) { | ||
| return; | ||
| } | ||
| const requiredFileHash = encipherImport(resolveImport(importName, fileName)); | ||
|
|
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| let replace = null; | ||
|
|
||
| replace = importRegistration({ | ||
| MARK: t.stringLiteral(`imported_${requiredFileHash}_component`), | ||
| IMPORT: newImport, | ||
| }); | ||
|
|
||
| hasImports.add(fileName); | ||
| visitedNodes.set(newImport, true); | ||
|
|
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| parentPath.replaceWith(replace); | ||
| }, | ||
| }); | ||
| }, | ||
|
|
||
| finish(node: any, filename: string) { | ||
| if (!hasImports.has(filename)) { | ||
| return; | ||
| } | ||
| node.body.unshift(headerTemplate()); | ||
| }, | ||
|
|
||
| hasImports, | ||
| }; | ||
| }; | ||
|
|
||
| export const babelPlugin = (babel: any, options: ImportedConfiguration = {}) => { | ||
| const transformer = createTransformer(babel, false, { | ||
| ...defaultConfiguration, | ||
| ...options, | ||
| }); | ||
|
|
||
| return { | ||
| inherits: syntax, | ||
|
|
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| visitor: { | ||
| Program: { | ||
| enter(programPath: any, { file }: any) { | ||
| transformer.traverse(programPath, file.opts.filename); | ||
| }, | ||
|
|
||
| exit({ node }: any, { file }: any) { | ||
| transformer.finish(node, file.opts.filename); | ||
| }, | ||
| }, | ||
| }, | ||
| }; | ||
| }; |
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