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validate-npm-package-license
============================
Give me a string and I'll tell you if it's a valid npm package license string.
<!-- js var valid = require('./'); -->
```js
var noWarnings = {
validForNewPackages: true,
validForOldPackages: true
};
// SPDX license identifier for common open-source licenses
valid('MIT'); // => noWarnings
valid('BSD-2-Clause'); // => noWarnings
valid('Apache-2.0'); // => noWarnings
valid('ISC'); // => noWarnings
// Simple SPDX license expression for dual licensing
valid('(GPL-3.0 OR BSD-2-Clause)'); // => noWarnings
// Refer to a non-standard license found in the package
valid('SEE LICENSE IN LICENSE.txt'); // => noWarnings
valid('SEE LICENSE IN license.md'); // => noWarnings
// No license
valid('UNLICENSED'); // => noWarnings
valid('UNLICENCED'); // => noWarnings
var warningsWithSuggestion = {
validForOldPackages: false,
validForNewPackages: false,
warnings: [
'license should be ' +
'a valid SPDX license expression without "LicenseRef", ' +
'"UNLICENSED", or ' +
'"SEE LICENSE IN <filename>"',
'license is similar to the valid expression "Apache-2.0"'
]
};
// Almost a valid SPDX license identifier
valid('Apache 2.0'); // => warningsWithSuggestion
var warningAboutLicenseRef = {
validForOldPackages: false,
validForNewPackages: false,
warnings: [
'license should be ' +
'a valid SPDX license expression without "LicenseRef", ' +
'"UNLICENSED", or ' +
'"SEE LICENSE IN <filename>"',
]
};
// LicenseRef-* identifiers are valid SPDX expressions,
// but not valid in package.json
valid('LicenseRef-Made-Up'); // => warningAboutLicenseRef
valid('(MIT OR LicenseRef-Made-Up)'); // => warningAboutLicenseRef
```
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