44 lines
1.2 KiB
TypeScript
44 lines
1.2 KiB
TypeScript
export type JSONDataTypes = string | number | boolean
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export type JSONObject<Value = JSONDataTypes, Key extends string = string> = {
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[key in Key]: Value
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}
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export function defaultJson(data: string, defaultValue: string | JSONObject = '') {
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if (data.length === 0) {
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//no existing data, give the default value instead
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if (typeof defaultValue === 'string') {
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return defaultValue
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} else {
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return JSON.stringify(defaultValue)
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}
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} else if (typeof defaultValue !== 'string') {
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//existing data should be compared
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//nothing to compare if default value is string
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try {
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let foundJson = JSON.parse(data)
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for (let key in defaultValue) {
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if (
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!(key in foundJson) ||
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typeof foundJson[key] !== typeof defaultValue[key]
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) {
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//key doesnt exist OR key exists, but type is incorrect
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foundJson[key] = defaultValue[key]
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}
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}
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return JSON.stringify(foundJson)
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} catch (e) {
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//couldn't parse data
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return JSON.stringify(defaultValue)
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}
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}
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return data
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} |