diff --git a/extensions/grunt/tsconfig.json b/extensions/grunt/tsconfig.json
index e804fa3acd7..51007d3cc84 100644
--- a/extensions/grunt/tsconfig.json
+++ b/extensions/grunt/tsconfig.json
@@ -6,11 +6,11 @@
 			"es2016"
 		],
 		"outDir": "./out",
-		"strictNullChecks": true,
 		"noImplicitAny": true,
 		"noImplicitReturns": true,
 		"noUnusedLocals": true,
-		"noUnusedParameters": true
+		"noUnusedParameters": true,
+		"strict": true
 	},
 	"include": [
 		"src/**/*"
diff --git a/extensions/gulp/tsconfig.json b/extensions/gulp/tsconfig.json
index e804fa3acd7..51007d3cc84 100644
--- a/extensions/gulp/tsconfig.json
+++ b/extensions/gulp/tsconfig.json
@@ -6,11 +6,11 @@
 			"es2016"
 		],
 		"outDir": "./out",
-		"strictNullChecks": true,
 		"noImplicitAny": true,
 		"noImplicitReturns": true,
 		"noUnusedLocals": true,
-		"noUnusedParameters": true
+		"noUnusedParameters": true,
+		"strict": true
 	},
 	"include": [
 		"src/**/*"
diff --git a/extensions/jake/tsconfig.json b/extensions/jake/tsconfig.json
index e804fa3acd7..51007d3cc84 100644
--- a/extensions/jake/tsconfig.json
+++ b/extensions/jake/tsconfig.json
@@ -6,11 +6,11 @@
 			"es2016"
 		],
 		"outDir": "./out",
-		"strictNullChecks": true,
 		"noImplicitAny": true,
 		"noImplicitReturns": true,
 		"noUnusedLocals": true,
-		"noUnusedParameters": true
+		"noUnusedParameters": true,
+		"strict": true
 	},
 	"include": [
 		"src/**/*"
diff --git a/extensions/markdown/tsconfig.json b/extensions/markdown/tsconfig.json
index d4e37635588..c85599b62fe 100644
--- a/extensions/markdown/tsconfig.json
+++ b/extensions/markdown/tsconfig.json
@@ -9,11 +9,11 @@
 		],
 		"outDir": "./out",
 		"sourceMap": true,
-		"strictNullChecks": true,
 		"noImplicitAny": true,
 		"noImplicitReturns": true,
 		"noUnusedLocals": true,
-		"noUnusedParameters": true
+		"noUnusedParameters": true,
+		"strict": true
 	},
 	"include": [
 		"src/**/*"
diff --git a/extensions/npm/tsconfig.json b/extensions/npm/tsconfig.json
index e804fa3acd7..51007d3cc84 100644
--- a/extensions/npm/tsconfig.json
+++ b/extensions/npm/tsconfig.json
@@ -6,11 +6,11 @@
 			"es2016"
 		],
 		"outDir": "./out",
-		"strictNullChecks": true,
 		"noImplicitAny": true,
 		"noImplicitReturns": true,
 		"noUnusedLocals": true,
-		"noUnusedParameters": true
+		"noUnusedParameters": true,
+		"strict": true
 	},
 	"include": [
 		"src/**/*"
diff --git a/extensions/typescript/tsconfig.json b/extensions/typescript/tsconfig.json
index da4f1bb399b..bec41102e78 100644
--- a/extensions/typescript/tsconfig.json
+++ b/extensions/typescript/tsconfig.json
@@ -7,7 +7,6 @@
 			"es2015.promise"
 		],
 		"outDir": "./out",
-		"strictNullChecks": true,
 		"noImplicitAny": true,
 		"noImplicitReturns": true,
 		"noUnusedLocals": true,