@typed/test/lib.es2015/typescript/createLanguageService.js

Testing made simple.

import { existsSync, readFileSync } from 'fs';
import { isAbsolute, join } from 'path';
import * as ts from 'typescript';
import { getScriptFileNames } from '../cli/getScriptFileNames';
export function createLanguageService(cwd, fileGlobs, compilerOptions, files) {
    const servicesHost = {
        getScriptFileNames: () => getScriptFileNames(cwd, fileGlobs),
        getScriptVersion: fileName => {
            const key = isAbsolute(fileName) ? fileName : join(cwd, fileName);
            return files[key] && files[key].version.toString();
        },
        getScriptSnapshot: fileName => {
            const pathname = isAbsolute(fileName) ? fileName : join(cwd, fileName);
            if (!existsSync(pathname)) {
                return undefined;
            }
            return ts.ScriptSnapshot.fromString(readFileSync(pathname).toString());
        },
        getCurrentDirectory: () => cwd,
        getCompilationSettings: () => compilerOptions,
        getDefaultLibFileName: options => ts.getDefaultLibFilePath(options),
        fileExists: ts.sys.fileExists,
        readFile: ts.sys.readFile,
        readDirectory: ts.sys.readDirectory,
    };
    return ts.createLanguageService(servicesHost, ts.createDocumentRegistry());
}
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