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jspears/SimpleTemplate.md

Created October 17, 2023 17:22
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A little template language
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SimpleTemplate.md

Playground

type Trim<S> = S extends (` ${infer V}` | `${infer V} ` |`${infer V}`) ? V : never;

type Templ<S> = S extends `${string}{{${infer Prop extends string}}}${infer Right}` ? {[k in Trim<Prop>]: string} & Templ<Right> : {};

function templ<T extends string, V = Templ<T>>(str:T, sub:V){
    return str.replaceAll(/{{\s*(.+?)\s*}}/g, (a,prop)=>sub[prop] ?? '' );
}

const s = templ(`hello {{ name }} nice to {{greet}} you`, {name:'Bob', greet:'meet'})
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