3 examples of 'license should be a valid spdx license expression' in JavaScript

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function _getSpdxLicenseInformation(license) {
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    var licenses = [];
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    try {
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        var tree;
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        if (typeof license === "string") {
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            tree = spdxParse(license);
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        } else {
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            tree = license;
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        }
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        if (tree.license) {
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            licenses.push(tree.license);
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        }
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        if (tree.left) {
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            licenses = licenses.concat(_getSpdxLicenseInformation(tree.left));
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        }
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        if (tree.right) {
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            licenses = licenses.concat(_getSpdxLicenseInformation(tree.right));
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        }
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    } catch(e) {
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        console.warn(`WARNING: Unable to parse license "${license}"`);
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    }
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    return licenses;
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}

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function passesSpdx(license, accepted) {
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  try {
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    return spdxSatisfies(license, `(${accepted.join(' OR ')})`)
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  } catch (_) {
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    return false;
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  }
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}

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function normalizeLicense(name, license) {
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    // Handle { type: 'MIT', url: 'http://..' }
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    if (license && license.type) {
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        license = license.type;
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    }
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    // Ensure that the license is a non-empty string
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    // Note that `spdx-correct` throws on strings with empty chars, so we must use trim()
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    // e.g.: webjs-cli
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    if (typeof license !== 'string' || !license.trim()) {
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        log.warn({ license }, `Invalid license for package ${name} was found`);
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        return null;
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    }
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    // Try to correct licenses that are not valid SPDX identifiers
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    if (!spdx.valid(license)) {
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        const correctedLicense = spdxCorrect(license);
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        if (correctedLicense) {
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            log.debug(`Package ${name} license was corrected from ${license} to ${correctedLicense}`);
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            license = correctedLicense;
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        } else {
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            log.warn({ license }, `License for package ${name} is not a valid SPDX indentifier`);
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            license = null;
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        }
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    }
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    return license;
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}