@babel/template 7.29.7

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:npm/%40babel/template@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/template@7.29.7

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:cb4d7a7a5a5c4b542b7e5a8177df24bb24b09cc7cd73383f0689b61f098c8a1c","contract":["template function parses template string with uppercase placeholder identifiers and produces Statement AST nodes","template.ast directly parses code strings into AST nodes without requiring placeholder substitution","template.expression parses template strings and returns Expression AST nodes with substituted values","template.statement parses single statement template strings into Statement AST nodes with substituted identifiers","template.statements parses multi-statement templates into an array of Statement AST nodes","template.program produces a Program AST node with specified body and statements","template throws an error when parsing invalid JavaScript template syntax"],"goal":"verify pkg:npm/%40babel/template@7.29.7","kind":"HOW","packages":["pkg:npm/%40babel/template@7.29.7"],"schemaVersion":1},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40babel/template@7.29.7"],"schemaVersion":1,"subject":"pkg:npm/%40babel/template@7.29.7","verifierAdapter":"node-typescript@1"}

{
  "name": "sample-babel-template",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-babel-template",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "@babel/template": "7.29.7"
      }
    },
    "node_modules/@babel/code-frame": {
      "version": "7.29.7",
      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.7.tgz",
      "integrity": "sha512-Aup7aUOfpbAUg2ROOJN6Iw5f9DMBlzu0mIkm/malLQFN/YQgO48wCj0Kxa3sEHJvPVFg7siR+qRInwXd2qhQKw==",
      "license": "MIT",
      "dependencies": {
        "@babel/helper-validator-identifier": "^7.29.7",
        "js-tokens": "^4.0.0",
        "picocolors": "^1.1.1"
      },
      "engines": {
        "node": ">=6.9.0"
      }
    },
    "node_modules/@babel/helper-string-parser": {
      "version": "7.29.7",
      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.29.7.tgz",
      "integrity": "sha512-Pb5ijPrZ89GDH8223L4UP8i6QApWxs04RbPQJTeWDV0/keR2E36MeKnyr6LYmUUvqRRI+Iv87SuF1W6ErINzYw==",
      "license": "MIT",
      "engines": {
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    },
    "node_modules/@babel/helper-validator-identifier": {
      "version": "7.29.7",
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      "license": "MIT",
      "engines": {
        "node": ">=6.9.0"
      }
    },
    "node_modules/@babel/parser": {
      "version": "7.29.8",
      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.29.8.tgz",
      "integrity": "sha512-E8lTAYNB1KW+FH+VGJuZM1ioAx2E6oVlvQFRrf5P8ZZmsiJXYAD9vTFV7yyEURNzgh1dFqMZuO6tUwcARbqFCA==",
      "license": "MIT",
      "dependencies": {
        "@babel/types": "^7.29.8"
      },
      "bin": {
        "parser": "bin/babel-parser.js"
      },
      "engines": {
        "node": ">=6.0.0"
      }
    },
    "node_modules/@babel/template": {
      "version": "7.29.7",
      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.29.7.tgz",
      "integrity": "sha512-puq+Gf35oI24FeN11LkoUQFqv9uwNeWpxXZi/Ji3rRIoKAzKnxRaZ+Gkj0vKS9ZCiTESfng1N9LyOyXvo+m+Gg==",
      "license": "MIT",
      "dependencies": {
        "@babel/code-frame": "^7.29.7",
        "@babel/parser": "^7.29.7",
        "@babel/types": "^7.29.7"
      },
      "engines": {
        "node": ">=6.9.0"
      }
    },
    "node_modules/@babel/types": {
      "version": "7.29.8",
      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.29.8.tgz",
      "integrity": "sha512-Vj1jF3cPfxg7OAfoI7QnVKLoILlm2JF9pnVHrX8qx7AHMiYWT+NDAA7jChlNgRS4WTLc/fD1lXLmPixluj+3Gg==",
      "license": "MIT",
      "dependencies": {
        "@babel/helper-string-parser": "^7.29.7",
        "@babel/helper-validator-identifier": "^7.29.7"
      },
      "engines": {
        "node": ">=6.9.0"
      }
    },
    "node_modules/js-tokens": {
      "version": "4.0.0",
      "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
      "integrity": "sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==",
      "license": "MIT"
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      "license": "ISC"
    }
  }
}

{
  "name": "sample-babel-template",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/template": "7.29.7"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/template@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/template@7.29.7"
  ]
}

import templatePkg from "@babel/template";

const template = typeof templatePkg === "function" ? templatePkg : templatePkg.default;
const { expression, statement, statements, program, ast } = templatePkg;

export function buildStatement(templateStr, placeholders = {}) {
  const fn = template(templateStr);
  return fn(placeholders);
}

export function parseAst(codeStr) {
  return (template.ast || ast)(codeStr);
}

export function buildExpression(templateStr, placeholders = {}) {
  const fn = (template.expression || expression)(templateStr);
  return fn(placeholders);
}

export function buildSingleStatement(templateStr, placeholders = {}) {
  const fn = (template.statement || statement)(templateStr);
  return fn(placeholders);
}

export function buildStatements(templateStr, placeholders = {}) {
  const fn = (template.statements || statements)(templateStr);
  return fn(placeholders);
}

export function buildProgram(templateStr, placeholders = {}) {
  const fn = (template.program || program)(templateStr);
  return fn(placeholders);
}

import assert from "node:assert/strict";
import {
  buildStatement,
  parseAst,
  buildExpression,
  buildSingleStatement,
  buildStatements,
  buildProgram
} from "../src/index.mjs";

// Test 1: template function parses template string with uppercase placeholder identifiers and produces Statement AST nodes
{
  const astNode = buildStatement("const IMPORT_NAME = require(SOURCE);", {
    IMPORT_NAME: { type: "Identifier", name: "myModule" },
    SOURCE: { type: "StringLiteral", value: "my-lib" }
  });
  assert.equal(astNode.type, "VariableDeclaration");
  assert.equal(astNode.declarations.length, 1);
  assert.equal(astNode.declarations[0].id.name, "myModule");
  assert.equal(astNode.declarations[0].init.type, "CallExpression");
  assert.equal(astNode.declarations[0].init.callee.name, "require");
  assert.equal(astNode.declarations[0].init.arguments[0].value, "my-lib");
}

// Test 2: template.ast directly parses code strings into AST nodes without requiring placeholder substitution
{
  const astNode = parseAst("const answer = 42;");
  assert.equal(astNode.type, "VariableDeclaration");
  assert.equal(astNode.declarations[0].id.name, "answer");
  assert.equal(astNode.declarations[0].init.value, 42);
}

// Test 3: template.expression parses template strings and returns Expression AST nodes with substituted values
{
  const exprNode = buildExpression("A + B", {
    A: { type: "Identifier", name: "x" },
    B: { type: "Identifier", name: "y" }
  });
  assert.equal(exprNode.type, "BinaryExpression");
  assert.equal(exprNode.operator, "+");
  assert.equal(exprNode.left.name, "x");
  assert.equal(exprNode.right.name, "y");
}

// Test 4: template.statement parses single statement template strings into Statement AST nodes with substituted identifiers
{
  const stmtNode = buildSingleStatement("return RESULT;", {
    RESULT: { type: "NumericLiteral", value: 100 }
  });
  assert.equal(stmtNode.type, "ReturnStatement");
  assert.equal(stmtNode.argument.value, 100);
}

// Test 5: template.statements parses multi-statement templates into an array of Statement AST nodes
{
  const stmts = buildStatements("let X = 1; let Y = 2;", {
    X: { type: "Identifier", name: "first" },
    Y: { type: "Identifier", name: "second" }
  });
  assert.equal(Array.isArray(stmts), true);
  assert.equal(stmts.length, 2);
  assert.equal(stmts[0].declarations[0].id.name, "first");
  assert.equal(stmts[1].declarations[0].id.name, "second");
}

// Test 6: template.program produces a Program AST node with specified body and statements
{
  const progNode = buildProgram("console.log(MSG);", {
    MSG: { type: "StringLiteral", value: "hello" }
  });
  assert.equal(progNode.type, "Program");
  assert.equal(progNode.body.length, 1);
  assert.equal(progNode.body[0].type, "ExpressionStatement");
}

// Test 7: template throws an error when parsing invalid JavaScript template syntax
{
  assert.throws(() => {
    buildStatement("function ( {");
  });
}

console.log("All @babel/template contract tests passed successfully.");