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moduleSpecifierCache.ts
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95 lines (90 loc) · 4.53 KB
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/*@internal*/
namespace ts.server {
export interface ModuleSpecifierResolutionCacheHost {
watchNodeModulesForPackageJsonChanges(directoryPath: string): FileWatcher;
}
export function createModuleSpecifierCache(host: ModuleSpecifierResolutionCacheHost): ModuleSpecifierCache {
let containedNodeModulesWatchers: ESMap<string, FileWatcher> | undefined;
let cache: ESMap<Path, ResolvedModuleSpecifierInfo> | undefined;
let currentKey: string | undefined;
const result: ModuleSpecifierCache = {
get(fromFileName, toFileName, preferences) {
if (!cache || currentKey !== key(fromFileName, preferences)) return undefined;
return cache.get(toFileName);
},
set(fromFileName, toFileName, preferences, modulePaths, moduleSpecifiers) {
ensureCache(fromFileName, preferences).set(toFileName, createInfo(modulePaths, moduleSpecifiers, /*isAutoImportable*/ true));
// If any module specifiers were generated based off paths in node_modules,
// a package.json file in that package was read and is an input to the cached.
// Instead of watching each individual package.json file, set up a wildcard
// directory watcher for any node_modules referenced and clear the cache when
// it sees any changes.
if (moduleSpecifiers) {
for (const p of modulePaths) {
if (p.isInNodeModules) {
// No trailing slash
const nodeModulesPath = p.path.substring(0, p.path.indexOf(nodeModulesPathPart) + nodeModulesPathPart.length - 1);
if (!containedNodeModulesWatchers?.has(nodeModulesPath)) {
(containedNodeModulesWatchers ||= new Map()).set(
nodeModulesPath,
host.watchNodeModulesForPackageJsonChanges(nodeModulesPath),
);
}
}
}
}
},
setModulePaths(fromFileName, toFileName, preferences, modulePaths) {
const cache = ensureCache(fromFileName, preferences);
const info = cache.get(toFileName);
if (info) {
info.modulePaths = modulePaths;
}
else {
cache.set(toFileName, createInfo(modulePaths, /*moduleSpecifiers*/ undefined, /*isAutoImportable*/ undefined));
}
},
setIsAutoImportable(fromFileName, toFileName, preferences, isAutoImportable) {
const cache = ensureCache(fromFileName, preferences);
const info = cache.get(toFileName);
if (info) {
info.isAutoImportable = isAutoImportable;
}
else {
cache.set(toFileName, createInfo(/*modulePaths*/ undefined, /*moduleSpecifiers*/ undefined, isAutoImportable));
}
},
clear() {
containedNodeModulesWatchers?.forEach(watcher => watcher.close());
cache?.clear();
containedNodeModulesWatchers?.clear();
currentKey = undefined;
},
count() {
return cache ? cache.size : 0;
}
};
if (Debug.isDebugging) {
Object.defineProperty(result, "__cache", { get: () => cache });
}
return result;
function ensureCache(fromFileName: Path, preferences: UserPreferences) {
const newKey = key(fromFileName, preferences);
if (cache && (currentKey !== newKey)) {
result.clear();
}
currentKey = newKey;
return cache ||= new Map();
}
function key(fromFileName: Path, preferences: UserPreferences) {
return `${fromFileName},${preferences.importModuleSpecifierEnding},${preferences.importModuleSpecifierPreference}`;
}
function createInfo(
modulePaths: readonly ModulePath[] | undefined,
moduleSpecifiers: readonly string[] | undefined,
isAutoImportable: boolean | undefined,
): ResolvedModuleSpecifierInfo {
return { modulePaths, moduleSpecifiers, isAutoImportable };
}
}
}