38 lines
1.5 KiB
TypeScript
38 lines
1.5 KiB
TypeScript
/**
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* Render email template by replacing variables
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* Supports {{variable}} and {{variable ?? defaultValue}} syntax
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* Also supports nested access like {{data.firstName}}
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*
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* Example:
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* renderTemplate('Hello {{name}}!', { name: 'World' }) -> 'Hello World!'
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* renderTemplate('Hello {{data.name}}!', { data: { name: 'World' } }) -> 'Hello World!'
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* renderTemplate('Hello {{name ?? Guest}}!', {}) -> 'Hello Guest!'
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*/
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export function renderTemplate(template: string, variables: Record<string, unknown>): string {
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return template.replace(/\{\{(.*?)\}\}/g, (match, key) => {
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const [mainKey, defaultValue] = key.split('??').map((s: string) => s.trim());
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// Handle nested property access (e.g., data.firstName)
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const getValue = (obj: Record<string, unknown>, path: string): unknown => {
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return path.split('.').reduce((current: Record<string, unknown> | unknown, key) => {
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if (current && typeof current === 'object' && !Array.isArray(current)) {
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return (current as Record<string, unknown>)[key];
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}
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return undefined;
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}, obj);
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};
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// Try multiple lookup strategies
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const value =
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getValue(variables, mainKey) || // Try as nested path (e.g., data.firstName)
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variables[mainKey] || // Try as top-level property
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(variables.data as Record<string, unknown>)?.[mainKey]; // Try in data object
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// Handle array values (for lists)
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if (Array.isArray(value)) {
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return value.map((e: string) => `<li>${e}</li>`).join('\n');
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}
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return value ?? defaultValue ?? '';
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});
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} |