diff --git a/app/lint-baseline.xml b/app/lint-baseline.xml
index b67d66f8f7..c357cc0639 100644
--- a/app/lint-baseline.xml
+++ b/app/lint-baseline.xml
@@ -61936,4 +61936,1258 @@
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diff --git a/mozilla-lint-rules/src/main/java/org/mozilla/fenix/lintrules/KotlinSyntheticsDetector.kt b/mozilla-lint-rules/src/main/java/org/mozilla/fenix/lintrules/KotlinSyntheticsDetector.kt
new file mode 100644
index 0000000000..92c5b88903
--- /dev/null
+++ b/mozilla-lint-rules/src/main/java/org/mozilla/fenix/lintrules/KotlinSyntheticsDetector.kt
@@ -0,0 +1,62 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+@file:Suppress("UnstableApiUsage")
+
+package org.mozilla.fenix.lintrules
+
+import com.android.tools.lint.client.api.UElementHandler
+import com.android.tools.lint.detector.api.Category
+import com.android.tools.lint.detector.api.Detector
+import com.android.tools.lint.detector.api.Implementation
+import com.android.tools.lint.detector.api.Issue
+import com.android.tools.lint.detector.api.JavaContext
+import com.android.tools.lint.detector.api.Scope
+import com.android.tools.lint.detector.api.Severity
+import com.android.tools.lint.detector.api.SourceCodeScanner
+import org.jetbrains.uast.UElement
+import org.jetbrains.uast.UImportStatement
+
+/**
+ * Custom Lint detector that checks for deprecated "kotlinx.android.synthetic" imports.
+ */
+class KotlinSyntheticsDetector : Detector(), SourceCodeScanner {
+
+ override fun createUastHandler(context: JavaContext) = object : UElementHandler() {
+ override fun visitImportStatement(node: UImportStatement) {
+ node.importReference?.asSourceString()?.let { import ->
+ if (import.startsWith(SYNTHETIC_IMPORT_PATTERN)) {
+ context.report(
+ DEPRECATED_KOTLIN_SYNTHETICS_ISSUE,
+ node,
+ context.getLocation(node),
+ DEPRECATED_KOTLIN_SYNTHETICS_MESSAGE
+ )
+ }
+ }
+ }
+ }
+
+ override fun getApplicableUastTypes(): List> {
+ return listOf(UImportStatement::class.java)
+ }
+
+ companion object {
+ private const val DEPRECATED_KOTLIN_SYNTHETICS_MESSAGE = "Kotlin synthetics are to be replaced with Jetpack View Binding. " +
+ "Please refer to https://github.com/mozilla-mobile/fenix/issues/17917 for more details."
+ private const val SYNTHETIC_IMPORT_PATTERN = "kotlinx.android.synthetic"
+
+ val DEPRECATED_KOTLIN_SYNTHETICS_ISSUE = Issue.create(
+ "KotlinSyntheticsDeprecation",
+ briefDescription = "Kotlin synthetics are deprecated and actively refactored out",
+ explanation = "The 'kotlin-android-extensions' Gradle plugin is deprecated and " +
+ "will be removed in a future Kotlin release in (or after) September 2021. " +
+ "We are to migrate to Jetpack View Binding. " +
+ "Please refer to https://github.com/mozilla-mobile/fenix/issues/17917",
+ category = Category.PRODUCTIVITY,
+ severity = Severity.ERROR,
+ implementation = Implementation(KotlinSyntheticsDetector::class.java, Scope.JAVA_FILE_SCOPE)
+ )
+ }
+}
diff --git a/mozilla-lint-rules/src/main/java/org/mozilla/fenix/lintrules/LintIssueRegistry.kt b/mozilla-lint-rules/src/main/java/org/mozilla/fenix/lintrules/LintIssueRegistry.kt
index a659a8fd01..ed6d3e208e 100644
--- a/mozilla-lint-rules/src/main/java/org/mozilla/fenix/lintrules/LintIssueRegistry.kt
+++ b/mozilla-lint-rules/src/main/java/org/mozilla/fenix/lintrules/LintIssueRegistry.kt
@@ -21,7 +21,8 @@ class LintIssueRegistry : IssueRegistry() {
TextViewAndroidSrcXmlDetector.ISSUE_XML_SRC_USAGE,
ImageViewAndroidTintXmlDetector.ISSUE_XML_SRC_USAGE,
LicenseDetector.ISSUE_MISSING_LICENSE,
- LicenseDetector.ISSUE_INVALID_LICENSE_FORMAT
+ LicenseDetector.ISSUE_INVALID_LICENSE_FORMAT,
+ KotlinSyntheticsDetector.DEPRECATED_KOTLIN_SYNTHETICS_ISSUE
) + ConstraintLayoutPerfDetector.ISSUES + ContextCompatDetector.ISSUES
override val vendor: Vendor = Vendor(
vendorName = "Mozilla",
diff --git a/mozilla-lint-rules/src/test/java/org/mozilla/fenix/lintrules/KotlinSyntheticsDetectorTest.kt b/mozilla-lint-rules/src/test/java/org/mozilla/fenix/lintrules/KotlinSyntheticsDetectorTest.kt
new file mode 100644
index 0000000000..6e94ee04ed
--- /dev/null
+++ b/mozilla-lint-rules/src/test/java/org/mozilla/fenix/lintrules/KotlinSyntheticsDetectorTest.kt
@@ -0,0 +1,71 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+@file:Suppress("UnstableApiUsage")
+
+package org.mozilla.fenix.lintrules
+
+import com.android.tools.lint.checks.infrastructure.LintDetectorTest
+import com.android.tools.lint.checks.infrastructure.TestFiles
+import com.android.tools.lint.detector.api.Detector
+import com.android.tools.lint.detector.api.Issue
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.junit.runners.JUnit4
+import org.mozilla.fenix.lintrules.KotlinSyntheticsDetector.Companion.DEPRECATED_KOTLIN_SYNTHETICS_ISSUE
+
+@RunWith(JUnit4::class)
+class KotlinSyntheticsDetectorTest : LintDetectorTest() {
+
+ override fun getIssues(): MutableList = mutableListOf(DEPRECATED_KOTLIN_SYNTHETICS_ISSUE)
+
+ override fun getDetector(): Detector = KotlinSyntheticsDetector()
+
+ @Test
+ fun `GIVEN no kotlin synthetics import WHEN KotlinSyntheticsDetector runs THEN there are no errors or exceptions`() {
+ val code = """
+ |package example
+ |
+ |import org.mozilla.fenix.databinding.OnboardingTrackingProtectionBinding
+ |
+ |class SomeExample {
+ | fun hello() {
+ | println("World")
+ | }
+ |}""".trimMargin()
+
+ lint()
+ .files(TestFiles.kt(code))
+ .allowCompilationErrors()
+ .allowMissingSdk(true)
+ .run()
+ .expectClean()
+ }
+
+ @Test
+ fun `GIVEN a kotlin synthetics import WHEN KotlinSyntheticsDetector runs THEN there are no errors or exceptions`() {
+ val code = """
+ |package example
+ |
+ |import kotlinx.android.synthetic.main.layout
+ |
+ |class SomeExample {
+ | fun hello() {
+ | println("World")
+ | }
+ |}""".trimMargin()
+
+ val expectedReport = """
+ |src/example/SomeExample.kt:3: Error: Kotlin synthetics are to be replaced with Jetpack View Binding. Please refer to https://github.com/mozilla-mobile/fenix/issues/17917 for more details. [KotlinSyntheticsDeprecation]
+ |import kotlinx.android.synthetic.main.layout
+ |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ |1 errors, 0 warnings""".trimMargin()
+
+ lint()
+ .files(TestFiles.kt(code))
+ .allowMissingSdk(true)
+ .run()
+ .expect(expectedReport)
+ }
+}