diff --git a/plugin/build.gradle.kts b/plugin/build.gradle.kts
index 0e83e16..6dda42c 100644
--- a/plugin/build.gradle.kts
+++ b/plugin/build.gradle.kts
@@ -42,13 +42,13 @@ tasks {
 // region publishing
 
 object Artifact {
-    val groupId = "co.uzzu.dotenv"
-    val artifactId = "gradle"
-    val version = "3.0.0"
+    const val GroupId = "co.uzzu.dotenv"
+    const val ArtifactId = "gradle"
+    const val Version = "3.0.0"
 }
 
-group = Artifact.groupId
-version = Artifact.version
+group = Artifact.GroupId
+version = Artifact.Version
 
 publishing {
     publishing {
@@ -57,7 +57,7 @@ publishing {
         }
 
         publications.create("pluginMaven", MavenPublication::class) {
-            artifactId = Artifact.artifactId
+            artifactId = Artifact.ArtifactId
         }
     }
 }
diff --git a/plugin/src/main/kotlin/co/uzzu/dotenv/DotEnvParser.kt b/plugin/src/main/kotlin/co/uzzu/dotenv/DotEnvParser.kt
index 6ee288e..90117e7 100644
--- a/plugin/src/main/kotlin/co/uzzu/dotenv/DotEnvParser.kt
+++ b/plugin/src/main/kotlin/co/uzzu/dotenv/DotEnvParser.kt
@@ -1,7 +1,7 @@
 package co.uzzu.dotenv
 
 object DotEnvParser {
-    private const val newLine = "\n"
+    private const val NewLine = "\n"
     private val newLinesRegex = Regex("""\\n""", option = RegexOption.MULTILINE)
     private val keyValRegex = Regex("""^\s*([\w.-]+)\s*=\s*(.*)?\s*$""")
     private val newLinesMatches = Regex("""\n|\r|\r\n""")
@@ -23,7 +23,7 @@ object DotEnvParser {
                 val trimmedValue = if (isDoubleQuoted || isSingleQuoted) {
                     val dequoted = rawValue.substring(1, rawValue.lastIndex)
                     if (isDoubleQuoted) {
-                        dequoted.replace(newLinesRegex, newLine)
+                        dequoted.replace(newLinesRegex, NewLine)
                     } else {
                         dequoted
                     }
diff --git a/plugin/src/main/kotlin/co/uzzu/dotenv/gradle/DotEnvProperties.kt b/plugin/src/main/kotlin/co/uzzu/dotenv/gradle/DotEnvProperties.kt
index ff0f5ae..e328579 100644
--- a/plugin/src/main/kotlin/co/uzzu/dotenv/gradle/DotEnvProperties.kt
+++ b/plugin/src/main/kotlin/co/uzzu/dotenv/gradle/DotEnvProperties.kt
@@ -39,7 +39,7 @@ open class DotEnvRoot(
     fun fetch(name: String) =
         envProvider.getenv()[name]
             ?: dotenvMap[name]
-            ?: throw IllegalStateException("""Environment variable $name was not set.""")
+            ?: error("""Environment variable $name was not set.""")
 
     /**
      * @return An environment variable
@@ -112,7 +112,7 @@ open class DotEnvProperty(
         get() =
             envProvider.getenv()[name]
                 ?: dotenvValue
-                ?: throw IllegalStateException("""Environment variable $name was not set.""")
+                ?: error("""Environment variable $name was not set.""")
 
     /**
      * @return An environment variable. If it was not set, returns specified default value
diff --git a/plugin/src/test/kotlin/co/uzzu/dotenv/DotEnvParserTest.kt b/plugin/src/test/kotlin/co/uzzu/dotenv/DotEnvParserTest.kt
index fba569a..890a917 100644
--- a/plugin/src/test/kotlin/co/uzzu/dotenv/DotEnvParserTest.kt
+++ b/plugin/src/test/kotlin/co/uzzu/dotenv/DotEnvParserTest.kt
@@ -9,8 +9,8 @@ class DotEnvParserTest {
     @Test
     fun testBasicParse() {
         val text = """
-            HOGE_API_KEY="dummy_key"
-            HOGE_API_SECRET="dummy_secret"
+        HOGE_API_KEY="dummy_key"
+        HOGE_API_SECRET="dummy_secret"
         """.trimIndent()
 
         val actual = DotEnvParser.parse(text)
@@ -23,8 +23,8 @@ class DotEnvParserTest {
     @Test
     fun emptyValue() {
         val text = """
-            HOGE_API_KEY=
-            HOGE_API_SECRET=
+        HOGE_API_KEY=
+        HOGE_API_SECRET=
         """.trimIndent()
 
         val actual = DotEnvParser.parse(text)
@@ -37,8 +37,8 @@ class DotEnvParserTest {
     @Test
     fun quotedValue() {
         val text = """
-            HOGE_API_KEY="dummy_key"
-            HOGE_API_SECRET='dummy_secret'
+        HOGE_API_KEY="dummy_key"
+        HOGE_API_SECRET='dummy_secret'
         """.trimIndent()
 
         val actual = DotEnvParser.parse(text)
@@ -51,8 +51,8 @@ class DotEnvParserTest {
     @Test
     fun incompleteQuoteValue() {
         val text = """
-            HOGE_API_KEY="dummy_key
-            HOGE_API_SECRET=dummy_secret'
+        HOGE_API_KEY="dummy_key
+        HOGE_API_SECRET=dummy_secret'
         """.trimIndent()
 
         val actual = DotEnvParser.parse(text)
@@ -65,8 +65,8 @@ class DotEnvParserTest {
     @Test
     fun singleCharQuoteValue() {
         val text = """
-            HOGE_API_KEY="
-            HOGE_API_SECRET='
+        HOGE_API_KEY="
+        HOGE_API_SECRET='
         """.trimIndent()
 
         val actual = DotEnvParser.parse(text)
diff --git a/plugin/src/test/kotlin/co/uzzu/dotenv/gradle/HierarchicalDotEnvDefinitionsTest.kt b/plugin/src/test/kotlin/co/uzzu/dotenv/gradle/HierarchicalDotEnvDefinitionsTest.kt
index 470eaf8..08a7a74 100644
--- a/plugin/src/test/kotlin/co/uzzu/dotenv/gradle/HierarchicalDotEnvDefinitionsTest.kt
+++ b/plugin/src/test/kotlin/co/uzzu/dotenv/gradle/HierarchicalDotEnvDefinitionsTest.kt
@@ -88,7 +88,7 @@ class HierarchicalDotEnvDefinitionsTest {
             file(
                 ".env",
                 """
-                    HOGE=100
+                HOGE=100
                 """.trimIndent()
             )
             directory("sub")