diff --git a/find-fast.js b/find-fast.js
new file mode 100644
index 000000000..b0465d51e
--- /dev/null
+++ b/find-fast.js
@@ -0,0 +1,68 @@
+var acorn = require('acorn');
+var defined = require('defined');
+
+var ST_NONE = 0;
+var ST_SAW_NAME = 1;
+var ST_INSIDE_CALL = 2;
+var ST_MEMBER_EXPRESSION = 3;
+
+module.exports = function findFast(src, opts) {
+    if (!opts) opts = {};
+    if (typeof src !== 'string') src = String(src);
+    if (opts.word === undefined) opts.word = 'require';
+
+    var tokenizer = acorn.tokenizer(src, opts.parse);
+    var token;
+    var state = ST_NONE;
+
+    var opener;
+    var args = [];
+
+    var modules = { strings: [], expressions: [] };
+    if (opts.nodes) modules.nodes = [];
+
+    while ((token = tokenizer.getToken()) && token.type !== acorn.tokTypes.eof) {
+        if (state !== ST_INSIDE_CALL && token.type === acorn.tokTypes.dot) {
+            state = ST_MEMBER_EXPRESSION;
+        } else if (state === ST_NONE && token.type === acorn.tokTypes.name && mayBeRequire(token)) {
+            state = ST_SAW_NAME;
+            opener = token;
+        } else if (state === ST_SAW_NAME && token.type === acorn.tokTypes.parenL) {
+            state = ST_INSIDE_CALL;
+            args = [];
+        } else if (state === ST_INSIDE_CALL) {
+            if (token.type === acorn.tokTypes.parenR) { // End of fn() call
+                if (args.length === 1 && args[0].type === acorn.tokTypes.string) {
+                    modules.strings.push(args[0].value);
+                } else if (args.length === 3 // A template string without any expressions
+                          && args[0].type === acorn.tokTypes.backQuote
+                          && args[1].type === acorn.tokTypes.template
+                          && args[2].type === acorn.tokTypes.backQuote) {
+                    modules.strings.push(args[1].value);
+                } else if (args.length > 0) {
+                    modules.expressions.push(src.slice(args[0].start, args[args.length - 1].end));
+                }
+
+                if (opts.nodes) {
+                    // Cut `src` at the end of this call, so that parseExpressionAt doesn't consider the `.abc` in
+                    // `require('xyz').abc`
+                    var chunk = src.slice(0, token.end);
+                    var node = acorn.parseExpressionAt(chunk, opener.start, opts.parse);
+                    modules.nodes.push(node);
+                }
+
+                state = ST_NONE;
+            } else {
+                args.push(token);
+            }
+        } else {
+            state = ST_NONE;
+        }
+    }
+    return modules;
+
+    function mayBeRequire(token) {
+        return token.type === acorn.tokTypes.name &&
+            token.value === opts.word;
+    }
+}
diff --git a/index.js b/index.js
index 382d701a9..fdd65b512 100644
--- a/index.js
+++ b/index.js
@@ -1,12 +1,14 @@
 var acorn = require('acorn-node');
 var walk = require('acorn-node/walk');
+var copy = require('shallow-copy');
 var defined = require('defined');
+var fastFind = require('./find-fast');
 
 var requireRe = /\brequire\b/;
 
-function parse (src, opts) {
-    if (!opts) opts = {};
-    return acorn.parse(src, {
+function getParseOpts (opts) {
+    opts = opts || {};
+    return {
         ecmaVersion: defined(opts.ecmaVersion, 9),
         sourceType: defined(opts.sourceType, 'script'),
         ranges: defined(opts.ranges, opts.range),
@@ -19,7 +21,7 @@ function parse (src, opts) {
             opts.allowImportExportEverywhere, true
         ),
         allowHashBang: defined(opts.allowHashBang, true)
-    });
+    };
 }
 
 var exports = module.exports = function (src, opts) {
@@ -28,6 +30,12 @@ var exports = module.exports = function (src, opts) {
 
 exports.find = function (src, opts) {
     if (!opts) opts = {};
+    else opts = copy(opts);
+    opts.parse = getParseOpts(opts.parse);
+
+    if (!opts.isRequire && !opts.fullParse) {
+        return fastFind(src, opts);
+    }
     
     var word = opts.word === undefined ? 'require' : opts.word;
     if (typeof src !== 'string') src = String(src);
@@ -44,11 +52,12 @@ exports.find = function (src, opts) {
     var wordRe = word === 'require' ? requireRe : RegExp('\\b' + word + '\\b');
     if (!wordRe.test(src)) return modules;
     
-    var ast = parse(src, opts.parse);
+    var ast = acorn.parse(src, opts.parse);
     
     function visit(node, st, c) {
         var hasRequire = wordRe.test(src.slice(node.start, node.end));
         if (!hasRequire) return;
+        if (redefinesRequire(node)) return;
         walk.base[node.type](node, st, c);
         if (node.type !== 'CallExpression') return;
         if (isRequire(node)) {
@@ -75,6 +84,18 @@ exports.find = function (src, opts) {
         Statement: visit,
         Expression: visit
     });
+
+    // Detect `require` redefinitions in function parameter lists, like
+    // in `[function(require,module,exports){` generated by browser-pack.
+    // This is a simple way to address the 99% case without doing full scope analysis
+    function redefinesRequire(node) {
+        if (node.type === 'FunctionExpression') {
+            return node.params.some(function (param) {
+                return param.type === 'Identifier' && param.name === word;
+            });
+        }
+        return false;
+    }
     
     return modules;
 };
diff --git a/package.json b/package.json
index 610bbd0bd..bfed9f14c 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
   "dependencies": {
     "acorn-node": "^1.3.0",
     "defined": "^1.0.0",
-    "minimist": "^1.1.1"
+    "shallow-copy": "0.0.1"
   },
   "devDependencies": {
     "tap": "^10.7.3"
diff --git a/test/comment.js b/test/comment.js
new file mode 100644
index 000000000..985ec5d61
--- /dev/null
+++ b/test/comment.js
@@ -0,0 +1,11 @@
+var test = require('tap').test;
+var detective = require('../');
+var fs = require('fs');
+var src = fs.readFileSync(__dirname + '/files/comment.js');
+
+test('comment', function (t) {
+    var modules = detective.find(src);
+    t.deepEqual(modules.strings, [ 'beep' ]);
+    t.notOk(modules.nodes, 'has no nodes');
+    t.end();
+});
diff --git a/test/files/comment.js b/test/files/comment.js
new file mode 100644
index 000000000..7664ebeb0
--- /dev/null
+++ b/test/files/comment.js
@@ -0,0 +1,5 @@
+var x = require /* idk */
+// whatever
+(
+'beep' // boop
+)
diff --git a/test/files/scope.js b/test/files/scope.js
new file mode 100644
index 000000000..66ca0aed5
--- /dev/null
+++ b/test/files/scope.js
@@ -0,0 +1,8 @@
+(function(modules){
+    modules[1](function(i){return modules[i]()})
+})({1:[function (require,module,exports) {
+    require('./y')
+},{'./y':2}],2:function(require,module,exports){
+    console.log("abc")
+}})
+require('./z')
diff --git a/test/scope.js b/test/scope.js
new file mode 100644
index 000000000..e6b29bbb9
--- /dev/null
+++ b/test/scope.js
@@ -0,0 +1,9 @@
+var test = require('tap').test;
+var detective = require('../');
+var fs = require('fs');
+var src = fs.readFileSync(__dirname + '/files/scope.js');
+
+test('scope', function (t) {
+    t.plan(1);
+    t.deepEqual(detective(src), [ './z' ]);
+});