| 1 | import { VALID_PLACEMENTS } from './config.js';
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| 2 | export const plugin = async (schema, documents, config) => {
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| 3 | const placement = config.placement || 'prepend';
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| 4 | const { content } = config;
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| 5 | if (!VALID_PLACEMENTS.includes(placement)) {
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| 6 | throw Error(`Configuration provided for 'add' plugin is invalid: value of 'placement' field is not valid (valid values are: ${VALID_PLACEMENTS.join(', ')})`);
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| 7 | }
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| 8 | if (!content) {
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| 9 | throw Error(`Configuration provided for 'add' plugin is invalid: "content" is missing!`);
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| 10 | }
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| 11 | return {
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| 12 | content: null,
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| 13 | [placement]: Array.isArray(content) ? content : [content],
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| 14 | };
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| 15 | };
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| 16 | export default { plugin };
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