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const {
ArrayPrototypeJoin,
ArrayPrototypeMap,
ArrayPrototypeSlice,
RegExp,
SafeMap,
SafeSet,
StringPrototypeSplit,
StringPrototypeReplace,
Symbol,
} = primordials;
const { codes: { ERR_ASSERT_SNAPSHOT_NOT_SUPPORTED } } = require('internal/errors');
const AssertionError = require('internal/assert/assertion_error');
const { inspect } = require('internal/util/inspect');
const { getOptionValue } = require('internal/options');
const { validateString } = require('internal/validators');
const { once } = require('events');
const { createReadStream, createWriteStream } = require('fs');
const path = require('path');
const assert = require('assert');
const kUpdateSnapshot = getOptionValue('--update-assert-snapshot');
const kInitialSnapshot = Symbol('kInitialSnapshot');
const kDefaultDelimiter = '\n#*#*#*#*#*#*#*#*#*#*#*#\n';
const kDefaultDelimiterRegex = new RegExp(kDefaultDelimiter.replaceAll('*', '\\*').replaceAll('\n', '\r?\n'), 'g');
const kKeyDelimiter = /:\r?\n/g;
function getSnapshotPath() {
if (process.mainModule) {
const { dir, name } = path.parse(process.mainModule.filename);
return path.join(dir, `${name}.snapshot`);
}
if (!process.argv[1]) {
throw new ERR_ASSERT_SNAPSHOT_NOT_SUPPORTED();
}
const { dir, name } = path.parse(process.argv[1]);
return path.join(dir, `${name}.snapshot`);
}
function getSource() {
return createReadStream(getSnapshotPath(), { encoding: 'utf8' });
}
let _target;
function getTarget() {
_target ??= createWriteStream(getSnapshotPath(), { encoding: 'utf8' });
return _target;
}
function serializeName(name) {
validateString(name, 'name');
return StringPrototypeReplace(`${name}`, kKeyDelimiter, '_');
}
let writtenNames;
let snapshotValue;
let counter = 0;
async function writeSnapshot({ name, value }) {
const target = getTarget();
if (counter > 1) {
target.write(kDefaultDelimiter);
}
writtenNames = writtenNames || new SafeSet();
if (writtenNames.has(name)) {
throw new AssertionError({ message: `Snapshot "${name}" already used` });
}
writtenNames.add(name);
const drained = target.write(`${name}:\n${value}`);
await drained || once(target, 'drain');
}
async function getSnapshot() {
if (snapshotValue !== undefined) {
return snapshotValue;
}
if (kUpdateSnapshot) {
snapshotValue = kInitialSnapshot;
return kInitialSnapshot;
}
try {
const source = getSource();
let data = '';
for await (const line of source) {
data += line;
}
snapshotValue = new SafeMap(
ArrayPrototypeMap(
StringPrototypeSplit(data, kDefaultDelimiterRegex),
(item) => {
const arr = StringPrototypeSplit(item, kKeyDelimiter);
return [
arr[0],
ArrayPrototypeJoin(ArrayPrototypeSlice(arr, 1), ':\n'),
];
}
));
} catch (e) {
if (e.code === 'ENOENT') {
snapshotValue = kInitialSnapshot;
} else {
throw e;
}
}
return snapshotValue;
}
async function snapshot(input, name) {
const snapshot = await getSnapshot();
counter = counter + 1;
name = serializeName(name);
const value = inspect(input);
if (snapshot === kInitialSnapshot) {
await writeSnapshot({ name, value });
} else if (snapshot.has(name)) {
const expected = snapshot.get(name);
// eslint-disable-next-line no-restricted-syntax
assert.strictEqual(value, expected);
} else {
throw new AssertionError({ message: `Snapshot "${name}" does not exist`, actual: inspect(snapshot) });
}
}
module.exports = snapshot;
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