/
AssetResolver.ts
184 lines (160 loc) · 5.08 KB
/
AssetResolver.ts
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import path from 'path';
import escapeStringRegexp from 'escape-string-regexp';
import webpack from 'webpack';
import { HookMap, SyncHook } from 'tapable';
import { getAssetExtensionsRegExp } from '../../utils/assetExtensions';
/**
* {@link AssetResolver} configuration options.
*/
export interface AssetResolverConfig {
/**
* Override default asset extensions. If the asset matches one of the extensions, it will be process
* by the custom React Native asset resolver. Otherwise, the resolution will process normally and
* the asset will be handled by Webpack.
*/
extensions?: string[];
/**
* Override default scalable extensions, which processes only scalable assets like images
* to create a map of DPI variants of the asset.
*/
scalableExtensions?: string[];
/** Target application platform. */
platform: string;
}
export interface CollectedScales {
[key: string]: {
platform: string;
name: string;
};
}
interface CollectOptions {
name: string;
platform: string;
type: string;
}
// Resolver is not directly exposed from webpack types so we need to do some TS trickery to
// get the type.
type Resolver =
webpack.Compiler['resolverFactory']['hooks']['resolver'] extends HookMap<
infer H
>
? H extends SyncHook<infer S>
? S extends any[]
? S[0]
: never
: never
: never;
export class AssetResolver {
static collectScales(
scalableAssetExtensions: string[],
files: string[],
{ name, type, platform }: CollectOptions
): CollectedScales {
const regex = scalableAssetExtensions.includes(type)
? new RegExp(
`^${escapeStringRegexp(
name
)}(@\\d+(\\.\\d+)?x)?(\\.(${platform}|native))?.${escapeStringRegexp(
type
)}$`
)
: new RegExp(
`^${escapeStringRegexp(name)}(\\.(${platform}|native))?\\.${type}$`
);
const priority = (queryPlatform: string) =>
['native', platform].indexOf(queryPlatform);
// Build a map of files according to the scale
const output: CollectedScales = {};
for (const file of files) {
const match = regex.exec(file);
if (match) {
let [, scale, , , platform] = match;
scale = scale || '@1x';
if (
!output[scale] ||
priority(platform) > priority(output[scale].platform)
) {
output[scale] = { platform, name: file };
}
}
}
return output;
}
constructor(
public readonly config: AssetResolverConfig,
private compiler: webpack.Compiler
) {}
apply(resolver: Resolver) {
const platform = this.config.platform;
const test = getAssetExtensionsRegExp(this.config.extensions!);
const logger = this.compiler.getInfrastructureLogger('RepackAssetResolver');
resolver
.getHook('file')
.tapAsync('RepackAssetResolver', (request, _context, callback) => {
const requestPath = request.path;
if (
(typeof requestPath === 'string' && !test.test(requestPath)) ||
requestPath === false
) {
callback();
return;
}
logger.debug('Processing asset:', requestPath);
resolver.fileSystem.readdir(
path.dirname(requestPath),
(error, results) => {
if (error) {
callback();
return;
}
const basename = path.basename(requestPath);
const name = basename.replace(/\.[^.]+$/, '');
const type = path.extname(requestPath).substring(1);
const files = ((results as Array<string | Buffer>)?.filter(
(result) => typeof result === 'string'
) ?? []) as string[];
let resolved = files.includes(basename) ? requestPath : undefined;
if (!resolved) {
const map = AssetResolver.collectScales(
this.config.scalableExtensions!,
files,
{
name,
type,
platform,
}
);
const key = map['@1x']
? '@1x'
: Object.keys(map).sort(
(a, b) =>
Number(a.replace(/[^\d.]/g, '')) -
Number(b.replace(/[^\d.]/g, ''))
)[0];
resolved = map[key]?.name
? path.resolve(path.dirname(requestPath), map[key].name)
: undefined;
if (!resolved) {
logger.error('Cannot resolve:', requestPath, {
files,
scales: map,
});
callback();
return;
}
}
const resolvedFile = {
...request,
path: resolved,
relativePath:
request.relativePath &&
resolver.join(request.relativePath, resolved),
file: true,
};
logger.debug('Asset resolved:', requestPath, '->', resolved);
callback(null, resolvedFile);
}
);
});
}
}