Code block 49.js for - test.md

49.js

if (node.type === 'IfStatement') {
    // This allows us to generate different bundles based on the NODE_ENV value, allowing development and production builds
    // needs to be a binary expression
    if (node.test.type !== 'BinaryExpression') return;
    // check if either left or right are member expressions that look for the node env
    // check if either the left or right string literal, if it is lets build and compare the two
    const { left, right, operator } = node.test;

    if ((left.type === 'MemberExpression' || right.type === 'MemberExpression') && (left.type === 'Literal' || right.type === 'Literal')) {
        // the member expression and literal can be on either side of the test so figure that out and assign to variables
        const member = right.type === 'MemberExpression' ? right : left;
        const literal = right.type === 'Literal' ? right : left;

        // figure out if the member expression is actually referencing process.env.NODE_ENV if not return early
        if (member.object.type !== 'MemberExpression' || member.object.object === undefined || member.object.object.name !== 'process') return;
        if (member.object.property.name !== 'env' && member.property.name !== 'NODE_ENV') return;

        // evaluate test here
    }
}