@netlify/config/lib/validate/example.js

Netlify config module

import indentString from 'indent-string';
import { THEME } from '../log/theme.js';
import { serializeToml } from '../utils/toml.js';
// Print invalid value and example netlify.toml
export const getExample = function ({ value, key, prevPath, example, formatInvalid }) {
    const exampleA = typeof example === 'function' ? example(value, key, prevPath) : example;
    return `
${THEME.errorSubHeader('Invalid syntax')}

${indentString(getInvalidValue(value, prevPath, formatInvalid), 2)}

${THEME.subHeader('Valid syntax')}

${indentString(serializeToml(exampleA), 2)}`;
};
const getInvalidValue = function (value, prevPath, formatInvalid) {
    // slice() is temporary, so it does not mutate
    const invalidValue = [...prevPath].reverse().reduce(setInvalidValuePart, value);
    // If `formatInvalid` is supplied, we use it to format the invalid value
    // before serializing it to TOML and printing it.
    const formattedInvalidValue = typeof formatInvalid === 'function' ? formatInvalid(invalidValue) : invalidValue;
    const invalidValueA = serializeToml(formattedInvalidValue);
    return invalidValueA;
};
const setInvalidValuePart = function (value, part) {
    if (Number.isInteger(part)) {
        return [value];
    }
    return value === undefined ? {} : { [part]: value };
};