34 lines
949 B
JavaScript
34 lines
949 B
JavaScript
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"use strict";
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function dashify(str) {
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return str
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.replace(/([a-z])([A-Z])/g, '$1-$2')
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.toLowerCase();
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}
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module.exports = function (_a) {
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var directives = _a.directives;
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var keysSeen = {};
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return Object.keys(directives).reduce(function (result, originalKey) {
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var directive = dashify(originalKey);
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if (keysSeen[directive]) {
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throw new Error(originalKey + " is specified more than once");
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}
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keysSeen[directive] = true;
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var value = directives[originalKey];
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if (Array.isArray(value)) {
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value = value.join(' ');
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}
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else if (value === true) {
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value = '';
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}
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else if (value === false) {
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return result;
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}
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if (value) {
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return result.concat(directive + " " + value);
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}
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else {
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return result.concat(directive);
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}
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}, []).join('; ');
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};
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