@linaria/utils/esm/valueToLiteral.js

Blazing fast zero-runtime CSS in JS library

import { getSource } from './getSource';
import { isSerializable } from './isSerializable';
export function valueToLiteral(value, ex) {
  if (value === undefined) {
    return {
      type: 'Identifier',
      name: 'undefined'
    };
  }
  if (isSerializable(value)) {
    if (value === null) {
      return {
        type: 'NullLiteral'
      };
    }
    if (typeof value === 'string') {
      return {
        type: 'StringLiteral',
        value
      };
    }
    if (typeof value === 'number') {
      return {
        type: 'NumericLiteral',
        value
      };
    }
    if (typeof value === 'boolean') {
      return {
        type: 'BooleanLiteral',
        value
      };
    }
    if (Array.isArray(value)) {
      return {
        type: 'ArrayExpression',
        elements: value.map(v => valueToLiteral(v, ex))
      };
    }
    return {
      type: 'ObjectExpression',
      properties: Object.entries(value).map(([key, v]) => ({
        type: 'ObjectProperty',
        key: key.match(/^[a-zA-Z]\w*$/) ? {
          type: 'Identifier',
          name: key
        } : {
          type: 'StringLiteral',
          value: key
        },
        value: valueToLiteral(v, ex),
        computed: false,
        shorthand: false
      }))
    };
  }
  throw ex.buildCodeFrameError(`The expression evaluated to '${value}', which is probably a mistake. If you want it to be inserted into CSS, explicitly cast or transform the value to a string, e.g. - 'String(${getSource(ex)})'.`);
}
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