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CompilerHost.js
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CompilerHost.js
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import {
getDefaultLibFileName,
ScriptKind,
createSourceFile,
ScriptTarget,
} from 'typescript';
function getScriptKind(isJsx, filePath) {
const extension = (/(\.[a-z]+)$/.exec(filePath)?.[0] || '').toLowerCase();
switch (extension) {
case '.ts':
return ScriptKind.TS;
case '.tsx':
return ScriptKind.TSX;
case '.js':
return ScriptKind.JS;
case '.jsx':
return ScriptKind.JSX;
case '.json':
return ScriptKind.JSON;
default:
// unknown extension, force typescript to ignore the file extension, and respect the user's setting
return isJsx ? ScriptKind.TSX : ScriptKind.TS;
}
}
export class CompilerHost {
constructor(libs, isJsx) {
this.files = [];
this.isJsx = isJsx || false;
if (libs) {
for (const [key, value] of libs) {
this.files[key] = value;
}
}
}
fileExists(name) {
return !!this.files[name];
}
getCanonicalFileName(name) {
return name;
}
getCurrentDirectory() {
return '/';
}
getDirectories() {
return [];
}
getDefaultLibFileName(options) {
return '/' + getDefaultLibFileName(options);
}
getNewLine() {
return '\n';
}
useCaseSensitiveFileNames() {
return true;
}
writeFile() {
return null;
}
readFile(name) {
if (this.fileExists(name)) {
return this.files[name];
} else {
return ''; // fallback, in case if file is not available
}
}
getSourceFile(name) {
return createSourceFile(
name,
this.readFile(name),
ScriptTarget.Latest,
/* setParentNodes */ true,
getScriptKind(this.isJsx, name),
);
}
}