yiisoft/yii2 · error · yii\console\Exception

Unable to write output JavaScript file '{$outputFile}'.

Error message

Unable to write output JavaScript file '{$outputFile}'.

What it means

Error "Unable to write output JavaScript file '{$outputFile}'." thrown in yiisoft/yii2.

Source

Thrown at framework/console/controllers/AssetController.php:588

     * @param string $outputFile output file name.
     * @throws \yii\console\Exception on failure.
     */
    public function combineJsFiles($inputFiles, $outputFile)
    {
        $content = '';
        foreach ($inputFiles as $file) {
            // Add a semicolon to source code if trailing semicolon missing.
            // Notice: It needs a new line before `;` to avoid affection of line comment. (// ...;)
            $fileContent = rtrim(file_get_contents($file));
            if (substr($fileContent, -1) !== ';') {
                $fileContent .= "\n;";
            }
            $content .= "/*** BEGIN FILE: $file ***/\n"
                . $fileContent . "\n"
                . "/*** END FILE: $file ***/\n";
        }
        if (!file_put_contents($outputFile, $content)) {
            throw new Exception("Unable to write output JavaScript file '{$outputFile}'.");
        }
    }

    /**
     * Combines CSS files into a single one.
     * @param array $inputFiles source file names.
     * @param string $outputFile output file name.
     * @throws \yii\console\Exception on failure.
     */
    public function combineCssFiles($inputFiles, $outputFile)
    {
        $content = '';
        $outputFilePath = dirname($this->findRealPath($outputFile));
        foreach ($inputFiles as $file) {
            $content .= "/*** BEGIN FILE: $file ***/\n"
                . $this->adjustCssUrl(file_get_contents($file), dirname($this->findRealPath($file)), $outputFilePath)
                . "/*** END FILE: $file ***/\n";
        }

View on GitHub (pinned to 66f00d18a2)

When it happens

Trigger: Thrown at framework/console/controllers/AssetController.php:588 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of yiisoft/yii2@66f00d18a2 (2026-08-17). Data as JSON: /api/errors/9b82eaa107dde155. Report an issue: GitHub.