mirror of
https://github.com/oven-sh/bun
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0f7494569e
## Summary
- Implements the `%j` format specifier for `console.log` and related
console methods
- `%j` outputs the JSON stringified representation of the value
- Previously, `%j` was not recognized and was left as literal text in
the output
## Test plan
- [x] Run `bun bd test test/regression/issue/24234.test.ts` - all 5
tests pass
- [x] Verify tests fail with system Bun (`USE_SYSTEM_BUN=1`) to confirm
fix validity
- [x] Manual verification: `console.log('%j', {foo: 'bar'})` outputs
`{"foo":"bar"}`
## Example
Before (bug):
```
$ bun -e "console.log('%j %s', {foo: 'bar'}, 'hello')"
%j [object Object] hello
```
After (fixed):
```
$ bun -e "console.log('%j %s', {foo: 'bar'}, 'hello')"
{"foo":"bar"} hello
```
Closes #24234
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
73 lines
2.2 KiB
TypeScript
73 lines
2.2 KiB
TypeScript
import { expect, test } from "bun:test";
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import { bunEnv, bunExe } from "harness";
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test("console.log with %j should format as JSON", async () => {
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await using proc = Bun.spawn({
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cmd: [bunExe(), "-e", "console.log('%j', {foo: 'bar'})"],
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env: bunEnv,
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stderr: "pipe",
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});
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const [stdout, stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]);
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expect(stderr).toBe("");
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expect(stdout).toBe('{"foo":"bar"}\n');
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expect(exitCode).toBe(0);
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});
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test("console.log with %j should handle arrays", async () => {
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await using proc = Bun.spawn({
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cmd: [bunExe(), "-e", "console.log('%j', [1, 2, 3])"],
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env: bunEnv,
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stderr: "pipe",
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});
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const [stdout, stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]);
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expect(stderr).toBe("");
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expect(stdout).toBe("[1,2,3]\n");
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expect(exitCode).toBe(0);
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});
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test("console.log with %j should handle nested objects", async () => {
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await using proc = Bun.spawn({
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cmd: [bunExe(), "-e", "console.log('%j', {a: {b: {c: 123}}})"],
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env: bunEnv,
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stderr: "pipe",
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});
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const [stdout, stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]);
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expect(stderr).toBe("");
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expect(stdout).toBe('{"a":{"b":{"c":123}}}\n');
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expect(exitCode).toBe(0);
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});
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test("console.log with %j should handle primitives", async () => {
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await using proc = Bun.spawn({
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cmd: [bunExe(), "-e", "console.log('%j %j %j %j', 'string', 123, true, null)"],
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env: bunEnv,
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stderr: "pipe",
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});
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const [stdout, stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]);
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expect(stderr).toBe("");
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expect(stdout).toBe('"string" 123 true null\n');
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expect(exitCode).toBe(0);
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});
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test("console.log with %j and additional text", async () => {
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await using proc = Bun.spawn({
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cmd: [bunExe(), "-e", "console.log('Result: %j', {status: 'ok'})"],
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env: bunEnv,
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stderr: "pipe",
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});
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const [stdout, stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]);
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expect(stderr).toBe("");
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expect(stdout).toBe('Result: {"status":"ok"}\n');
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expect(exitCode).toBe(0);
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});
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