tsc-template/index.js

Utility to build TypeScript AST from a string, similar to @babel/template

import { createSourceFile, isIdentifier, isSourceFile, ScriptKind, ScriptTarget, transform, } from 'typescript';
import { createTransformer } from './createTransformer.js';
import { findBestNode } from './findBestNode.js';
import { $templateResult, isTemplateResult } from './TemplateResult.js';
export * from './createTransformer.js';
export default function ast(parts, ...fillers) {
    let code = '';
    const transformers = [];
    for (let i = 0; i < parts.length; i++) {
        const filler = fillers[i];
        code += parts[i];
        if (filler != null) {
            if (typeof filler === 'string') {
                code += filler;
            }
            else {
                const id = `$${crypto.randomUUID().replace(/-/gu, '_')}`;
                code += id;
                transformers.push(createTransformer((n) => isIdentifier(n) && n.text === id ? (isTemplateResult(filler) ? filler.node : filler) : n));
            }
        }
    }
    if (code.includes('%{') || code.includes('}%')) {
        code = code.replaceAll('%{', '/** @START */').replaceAll('}%', '/** @END */');
    }
    if (code.indexOf('/** @START */') !== code.lastIndexOf('/** @START */') ||
        code.indexOf('/** @END */') !== code.lastIndexOf('/** @END */')) {
        throw new Error('Only one set of code extractors is allowed: %{ ... }% or /** @START */ ... /** @END */');
    }
    const source = transform(createSourceFile('', code, ScriptTarget.Latest, false, ScriptKind.TSX), transformers)
        .transformed[0];
    return { brand: $templateResult, node: findBestNode(source), source };
}
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