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Avoid using lodash during config loading, for require() performance.

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This commit is contained in:
Logan Smyth 2017-12-01 17:53:03 -08:00
parent 600106b9cb
commit d4a8c7672c
1 changed files with 28 additions and 5 deletions
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33
packages/babel-core/src/config/index.js
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@ -3,7 +3,6 @@
import path from "path";
import * as context from "../index";
import Plugin from "./plugin";
import merge from "lodash/merge";
import {
buildRootChain,
buildPresetChain,
@ -13,10 +12,9 @@ import {
} from "./config-chain";
import type { UnloadedDescriptor } from "./config-descriptors";
import traverse from "@babel/traverse";
import clone from "lodash/clone";
import { makeWeakCache, type CacheConfigurator } from "./caching";
import { getEnv } from "./helpers/environment";
import { validate } from "./validation/options";
import { validate, type ValidatedOptions } from "./validation/options";
import { validatePluginObject } from "./validation/plugins";
type LoadedDescriptor = {
@ -141,7 +139,8 @@ export default function loadConfig(inputOpts: mixed): ResolvedConfig | null {
throw e;
}
const opts: Object = merge(optionDefaults, options);
const opts: Object = optionDefaults;
merge(opts, options);
// Tack the passes onto the object itself so that, if this object is passed back to Babel a second time,
// it will be in the right structure to not change behavior.
@ -161,6 +160,30 @@ export default function loadConfig(inputOpts: mixed): ResolvedConfig | null {
};
}
function merge(target: ValidatedOptions, source: ValidatedOptions): void {
for (const k of Object.keys(source)) {
if (k === "parserOpts" && source.parserOpts) {
const parserOpts = source.parserOpts;
const targetObj = (target.parserOpts = target.parserOpts || {});
mergeObject(targetObj, parserOpts);
} else if (k === "generatorOpts" && source.generatorOpts) {
const generatorOpts = source.generatorOpts;
const targetObj = (target.generatorOpts = target.generatorOpts || {});
mergeObject(targetObj, generatorOpts);
} else {
const val = source[k];
if (val !== undefined) target[k] = (val: any);
}
}
}
function mergeObject<T: {}>(target: T, source: T) {
for (const k of Object.keys(source)) {
const val = source[k];
if (val !== undefined) target[k] = (val: any);
}
}
/**
* Load a generic plugin/preset from the given descriptor loaded from the config object.
*/
@ -238,7 +261,7 @@ const instantiatePlugin = makeWeakCache(
const plugin = Object.assign({}, pluginObj);
if (plugin.visitor) {
plugin.visitor = traverse.explode(clone(plugin.visitor));
plugin.visitor = traverse.explode(Object.assign({}, plugin.visitor));
}
if (plugin.inherits) {