babel/packages/babel-code-frame/test/index.js

import assert from "assert";
import chalk from "chalk";
import codeFrame from "..";

describe("babel-code-frame", function () {
  it("basic usage", function () {
    const rawLines = [
      "class Foo {",
      "  constructor()",
      "};",
    ].join("\n");
    assert.equal(codeFrame(rawLines, 2, 16), [
      "  1 | class Foo {",
      "> 2 |   constructor()",
      "    |                ^",
      "  3 | };",
    ].join("\n"));
  });

  it("optional column number", function () {
    const rawLines = [
      "class Foo {",
      "  constructor()",
      "};",
    ].join("\n");
    assert.equal(codeFrame(rawLines, 2, null), [
      "  1 | class Foo {",
      "> 2 |   constructor()",
      "  3 | };",
    ].join("\n"));
  });

  it("optional column number", function () {
    const rawLines = [
      "class Foo {",
      "  constructor()",
      "};",
    ].join("\n");
    assert.equal(codeFrame(rawLines, 2, null), [
      "  1 | class Foo {",
      "> 2 |   constructor()",
      "  3 | };",
    ].join("\n"));
  });

  it("maximum context lines and padding", function () {
    const rawLines = [
      "/**",
      " * Sums two numbers.",
      " *",
      " * @param a Number",
      " * @param b Number",
      " * @returns Number",
      " */",
      "",
      "function sum(a, b) {",
      "  return a + b",
      "}"
    ].join("\n");
    assert.equal(codeFrame(rawLines, 7, 2), [
      "   5 |  * @param b Number",
      "   6 |  * @returns Number",
      ">  7 |  */",
      "     |  ^",
      "   8 | ",
      "   9 | function sum(a, b) {",
      "  10 |   return a + b",
    ].join("\n"));
  });

  it("no unnecessary padding due to one-off errors", function () {
    const rawLines = [
      "/**",
      " * Sums two numbers.",
      " *",
      " * @param a Number",
      " * @param b Number",
      " * @returns Number",
      " */",
      "",
      "function sum(a, b) {",
      "  return a + b",
      "}"
    ].join("\n");
    assert.equal(codeFrame(rawLines, 6, 2), [
      "  4 |  * @param a Number",
      "  5 |  * @param b Number",
      "> 6 |  * @returns Number",
      "    |  ^",
      "  7 |  */",
      "  8 | ",
      "  9 | function sum(a, b) {",
    ].join("\n"));
  });

  it("tabs", function () {
    const rawLines = [
      "\tclass Foo {",
      "\t  \t\t    constructor\t(\t)",
      "\t};",
    ].join("\n");
    assert.equal(codeFrame(rawLines, 2, 25), [
      "  1 | \tclass Foo {",
      "> 2 | \t  \t\t    constructor\t(\t)",
      "    | \t  \t\t               \t \t ^",
      "  3 | \t};",
    ].join("\n"));
  });

  it("opts.highlightCode", function () {
    const rawLines = "console.log('babel')";
    const result = codeFrame(rawLines, 1, 9, { highlightCode: true });
    const stripped = chalk.stripColor(result);
    assert.ok(result.length > stripped.length);
    assert.equal(stripped, [
      "> 1 | console.log('babel')",
      "    |         ^",
    ].join("\n"));
  });

  it("opts.linesAbove", function () {
    const rawLines = [
      "/**",
      " * Sums two numbers.",
      " *",
      " * @param a Number",
      " * @param b Number",
      " * @returns Number",
      " */",
      "",
      "function sum(a, b) {",
      "  return a + b",
      "}"
    ].join("\n");
    assert.equal(codeFrame(rawLines, 7, 2, { linesAbove: 1 }), [
      "   6 |  * @returns Number",
      ">  7 |  */",
      "     |  ^",
      "   8 | ",
      "   9 | function sum(a, b) {",
      "  10 |   return a + b",
    ].join("\n"));
  });

  it("opts.linesBelow", function () {
    const rawLines = [
      "/**",
      " * Sums two numbers.",
      " *",
      " * @param a Number",
      " * @param b Number",
      " * @returns Number",
      " */",
      "",
      "function sum(a, b) {",
      "  return a + b",
      "}"
    ].join("\n");
    assert.equal(codeFrame(rawLines, 7, 2, { linesBelow: 1 }), [
      "  5 |  * @param b Number",
      "  6 |  * @returns Number",
      "> 7 |  */",
      "    |  ^",
      "  8 | "
    ].join("\n"));
  });

  it("opts.linesAbove and opts.linesBelow", function () {
    const rawLines = [
      "/**",
      " * Sums two numbers.",
      " *",
      " * @param a Number",
      " * @param b Number",
      " * @returns Number",
      " */",
      "",
      "function sum(a, b) {",
      "  return a + b",
      "}"
    ].join("\n");
    assert.equal(codeFrame(rawLines, 7, 2, { linesAbove: 1, linesBelow: 1 }), [
      "  6 |  * @returns Number",
      "> 7 |  */",
      "    |  ^",
      "  8 | "
    ].join("\n"));
  });

  it("opts.forceColor", function() {
    const marker = chalk.red.bold;
    const gutter = chalk.grey;

    const rawLines = [
      "",
      "",
      "",
      ""
    ].join("\n");
    assert.equal(codeFrame(rawLines, 3, null, { linesAbove: 1, linesBelow: 1, forceColor: true }), chalk.reset([
      " " + gutter(" 2 | "),
      marker(">") + gutter(" 3 | "),
      " " + gutter(" 4 | ")
    ].join("\n")));
  });
});