/
transformHelpers.js
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/
transformHelpers.js
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/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow strict-local
* @format
* @oncall react_native
*/
'use strict';
import type Bundler from '../Bundler';
import type DeltaBundler, {TransformFn} from '../DeltaBundler';
import type {
BundlerResolution,
TransformInputOptions,
} from '../DeltaBundler/types.flow';
import type {TransformOptions} from '../DeltaBundler/Worker';
import type {ConfigT} from 'metro-config/src/configTypes.flow';
import type {Type} from 'metro-transform-worker';
import type {RequireContext} from './contextModule';
import {getContextModuleTemplate} from './contextModuleTemplates';
const path = require('path');
import type {ResolverInputOptions} from '../shared/types.flow';
type InlineRequiresRaw = {+blockList: {[string]: true, ...}, ...} | boolean;
type TransformOptionsWithRawInlines = {
...TransformOptions,
+inlineRequires: InlineRequiresRaw,
};
const baseIgnoredInlineRequires = ['React', 'react', 'react-native'];
async function calcTransformerOptions(
entryFiles: $ReadOnlyArray<string>,
bundler: Bundler,
deltaBundler: DeltaBundler<>,
config: ConfigT,
options: TransformInputOptions,
resolverOptions: ResolverInputOptions,
): Promise<TransformOptionsWithRawInlines> {
const baseOptions = {
customTransformOptions: options.customTransformOptions,
dev: options.dev,
hot: options.hot,
inlineRequires: false,
inlinePlatform: true,
minify: options.minify,
platform: options.platform,
runtimeBytecodeVersion: options.runtimeBytecodeVersion,
unstable_transformProfile: options.unstable_transformProfile,
};
// When we're processing scripts, we don't need to calculate any
// inlineRequires information, since scripts by definition don't have
// requires().
if (options.type === 'script') {
return {
...baseOptions,
type: 'script',
};
}
const getDependencies = async (path: string) => {
const dependencies = await deltaBundler.getDependencies([path], {
resolve: await getResolveDependencyFn(
bundler,
options.platform,
resolverOptions,
),
transform: await getTransformFn(
[path],
bundler,
deltaBundler,
config,
{
...options,
minify: false,
},
resolverOptions,
),
transformOptions: options,
onProgress: null,
experimentalImportBundleSupport:
config.server.experimentalImportBundleSupport,
unstable_allowRequireContext:
config.transformer.unstable_allowRequireContext,
shallow: false,
});
return Array.from(dependencies.keys());
};
const {transform} = await config.transformer.getTransformOptions(
entryFiles,
{dev: options.dev, hot: options.hot, platform: options.platform},
getDependencies,
);
return {
...baseOptions,
inlineRequires: transform?.inlineRequires || false,
experimentalImportSupport: transform?.experimentalImportSupport || false,
unstable_disableES6Transforms:
transform?.unstable_disableES6Transforms || false,
nonInlinedRequires:
transform?.nonInlinedRequires || baseIgnoredInlineRequires,
type: 'module',
};
}
function removeInlineRequiresBlockListFromOptions(
path: string,
inlineRequires: InlineRequiresRaw,
): boolean {
if (typeof inlineRequires === 'object') {
return !(path in inlineRequires.blockList);
}
return inlineRequires;
}
async function getTransformFn(
entryFiles: $ReadOnlyArray<string>,
bundler: Bundler,
deltaBundler: DeltaBundler<>,
config: ConfigT,
options: TransformInputOptions,
resolverOptions: ResolverInputOptions,
): Promise<TransformFn<>> {
const {inlineRequires, ...transformOptions} = await calcTransformerOptions(
entryFiles,
bundler,
deltaBundler,
config,
options,
resolverOptions,
);
return async (modulePath: string, requireContext: ?RequireContext) => {
let templateBuffer: Buffer;
if (requireContext) {
const graph = await bundler.getDependencyGraph();
// TODO: Check delta changes to avoid having to look over all files each time
// this is a massive performance boost.
// Search against all files, this is very expensive.
// TODO: Maybe we could let the user specify which root to check against.
const files = graph.matchFilesWithContext(requireContext.from, {
filter: requireContext.filter,
recursive: requireContext.recursive,
});
const template = getContextModuleTemplate(
requireContext.mode,
requireContext.from,
files,
);
templateBuffer = Buffer.from(template);
}
return await bundler.transformFile(
modulePath,
{
...transformOptions,
type: getType(
transformOptions.type,
modulePath,
config.resolver.assetExts,
),
inlineRequires: removeInlineRequiresBlockListFromOptions(
modulePath,
inlineRequires,
),
},
templateBuffer,
);
};
}
function getType(
type: string,
filePath: string,
assetExts: $ReadOnlyArray<string>,
): Type {
if (type === 'script') {
return type;
}
if (assetExts.indexOf(path.extname(filePath).slice(1)) !== -1) {
return 'asset';
}
return 'module';
}
async function getResolveDependencyFn(
bundler: Bundler,
platform: ?string,
resolverOptions: ResolverInputOptions,
): Promise<(from: string, to: string) => BundlerResolution> {
const dependencyGraph = await await bundler.getDependencyGraph();
return (from: string, to: string) =>
dependencyGraph.resolveDependency(
from,
to,
platform ?? null,
resolverOptions,
);
}
module.exports = {
getTransformFn,
getResolveDependencyFn,
};