Added in integrated JSLint checking against the jQuery source. Just run 'make lint' to see the result.

Makefile

@@ -29,11 +29,12 @@ JQ_MIN = ${DIST_DIR}/jquery.min.js
 JQ_VER = `cat version.txt`
 VER = sed s/@VERSION/${JQ_VER}/
 
+RHINO = java -jar ${BUILD_DIR}/js.jar
 MINJAR = java -jar ${BUILD_DIR}/google-compiler-20091218.jar
 
 DATE=`git log -1 | grep Date: | sed 's/[^:]*: *//'`
 
-all: jquery min
+all: jquery lint min
 	@@echo "jQuery build complete."
 
 ${DIST_DIR}:
@@ -49,7 +50,7 @@ init:
 jquery: ${DIST_DIR} selector ${JQ}
 jq: ${DIST_DIR} ${JQ}
 
-${JQ}: ${MODULES}
+${JQ}: selector ${MODULES}
 	@@echo "Building" ${JQ}
 
 	@@mkdir -p ${DIST_DIR}
@@ -58,10 +59,14 @@ ${JQ}: ${MODULES}
 		sed 's/Date:./&'"${DATE}"'/' | \
 		${VER} > ${JQ};
 
-selector: init
+selector: ${DIST_DIR} init
 	@@echo "Building selector code from Sizzle"
 	@@sed '/EXPOSE/r src/sizzle-jquery.js' src/sizzle/sizzle.js > src/selector.js
 
+lint: ${JQ}
+	@@echo "Checking jQuery against JSLint..."
+	@@${RHINO} build/jslint-check.js
+
 min: ${JQ_MIN}
 
 ${JQ_MIN}: ${JQ}

README.md

@@ -36,6 +36,10 @@ Makes: ./dist/jquery.js
 A compressed version of jQuery (made the Closure Compiler).  
 Makes: ./dist/jquery.min.js
 
+`make lint`
+
+Tests a build of jQuery against JSLint, looking for potential errors or bits of confusing code.
+
 `make selector`
 
 Builds the selector library for jQuery from Sizzle.  

build/jslint-check.js

@@ -0,0 +1,36 @@
+load("build/jslint.js");
+
+var src = readFile("dist/jquery.js");
+
+JSLINT(src, { evil: true, forin: true });
+
+// All of the following are known issues that we think are 'ok'
+// (in contradiction with JSLint) more information here:
+// http://docs.jquery.com/JQuery_Core_Style_Guidelines
+var ok = {
+	"Expected an identifier and instead saw 'undefined' (a reserved word).": true,
+	"Use '===' to compare with 'null'.": true,
+	"Use '!==' to compare with 'null'.": true,
+	"Expected an assignment or function call and instead saw an expression.": true,
+	"Expected a 'break' statement before 'case'.": true
+
+};
+
+var e = JSLINT.errors, found = 0, w;
+
+for ( var i = 0; i < e.length; i++ ) {
+	w = e[i];
+
+	if ( !ok[ w.reason ] ) {
+		found++;
+		print( "\n" + w.evidence + "\n" );
+		print( "    Problem at line " + w.line + " character " + w.character + ": " + w.reason );
+	}
+}
+
+if ( found > 0 ) {
+	print( "\n" + found + " Error(s) found." );
+
+} else {
+	print( "JSLint check passed." );
+}