babel-plugin-transform-strip-block/dist-web/index.js

A Babel Plugin to strip blocks of code marked by special comment tags.

import { declare } from '@babel/helper-plugin-utils';
import { inherits, objectExpression } from '@babel/types';

var index = declare((_api, opts) => {
  const {
    requireDirective = false,
    identifiers
  } = opts;
  const STRIP_DIRECTIVE = /@strip-block/;
  let skipStrip = false;

  function Handle(path) {
    const {
      node
    } = path;

    for (const identifier of identifiers) {
      const {
        start,
        end
      } = identifier;
      let stripStart = false;

      if (node.leadingComments && node.leadingComments.length > 0) {
        for (const comment of node.leadingComments) {
          if (new RegExp(start).test(comment.value)) {
            stripStart = true;
            comment.ignore = true;
          }
        }
      }

      let stripEnd = false;

      if (node.trailingComments && node.trailingComments.length > 0) {
        for (const comment of node.trailingComments) {
          if (new RegExp(end).test(comment.value)) {
            stripEnd = true;
            comment.ignore = true;
          }
        }
      }

      if (stripStart && stripEnd) {
        path.remove();
        return;
      }
    }
  }

  function HandleObjectExpression(path) {
    const {
      node
    } = path;
    const properties = [];

    for (const identifier of identifiers) {
      const {
        start,
        end
      } = identifier;
      let stripProperty = false;

      for (const property of node.properties) {
        if (property.leadingComments && property.leadingComments.length > 0) {
          for (const comment of property.leadingComments) {
            if (new RegExp(start).test(comment.value)) {
              comment.ignore = true;
              stripProperty = true;
            }
          }
        }

        if (!stripProperty) {
          properties.push(property);
        }

        if (property.trailingComments && property.trailingComments.length > 0) {
          for (const comment of property.trailingComments) {
            if (new RegExp(end).test(comment.value)) {
              comment.ignore = true;
              stripProperty = false;
            }
          }
        }
      }
    }

    path.stop();
    path.replaceWith(inherits(objectExpression(properties), node));
  }

  return {
    name: 'transform-strip-block',
    visitor: {
      Program(path, {
        file: {
          ast: {
            comments
          }
        }
      }) {
        skipStrip = false;
        let directiveFound = false;

        if (comments) {
          for (const comment of comments) {
            if (STRIP_DIRECTIVE.test(comment.value)) {
              directiveFound = true; // remove directive

              comment.value = comment.value.replace(STRIP_DIRECTIVE, ''); // remove the comment completely if it only consists of whitespace and/or stars

              if (!comment.value.replace(/\*/g, '').trim()) {
                comment.ignore = true;
              }
            }
          }
        }

        if (!directiveFound && requireDirective) {
          skipStrip = true;
        }
      },

      ObjectProperty(path) {
        if (skipStrip) return;
        Handle(path);
      },

      FunctionDeclaration(path) {
        if (skipStrip) return;
        Handle(path);
      },

      ExpressionStatement(path) {
        if (skipStrip) return;
        Handle(path);
      },

      VariableDeclaration(path) {
        if (skipStrip) return;
        Handle(path);
      },

      ObjectExpression(path) {
        if (skipStrip) return;
        HandleObjectExpression(path);
      }

    }
  };
});

export default index;
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