feat: support bool for env tag

core/mapping/unmarshaler.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"reflect"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -342,6 +343,14 @@ func (u *Unmarshaler) processFieldWithEnvValue(field reflect.StructField, value
 	envVal string, opts *fieldOptionsWithContext, fullName string) error {
 	fieldKind := field.Type.Kind()
 	switch fieldKind {
+	case reflect.Bool:
+		val, err := strconv.ParseBool(envVal)
+		if err != nil {
+			return fmt.Errorf("unmarshal field %q with environment variable, %w", fullName, err)
+		}
+
+		value.SetBool(val)
+		return nil
 	case durationType.Kind():
 		if err := fillDurationValue(fieldKind, value, envVal); err != nil {
 			return fmt.Errorf("unmarshal field %q with environment variable, %w", fullName, err)

core/mapping/unmarshaler_test.go

@@ -3186,6 +3186,47 @@ func TestUnmarshal_EnvFloatOverwrite(t *testing.T) {
 	assert.Equal(t, float32(123.45), v.Age)
 }
 
+func TestUnmarshal_EnvBoolTrue(t *testing.T) {
+	type Value struct {
+		Enable bool `key:"enable,env=TEST_NAME_BOOL_TRUE"`
+	}
+
+	const envName = "TEST_NAME_BOOL_TRUE"
+	os.Setenv(envName, "true")
+	defer os.Unsetenv(envName)
+
+	var v Value
+	assert.NoError(t, UnmarshalKey(emptyMap, &v))
+	assert.True(t, v.Enable)
+}
+
+func TestUnmarshal_EnvBoolFalse(t *testing.T) {
+	type Value struct {
+		Enable bool `key:"enable,env=TEST_NAME_BOOL_FALSE"`
+	}
+
+	const envName = "TEST_NAME_BOOL_FALSE"
+	os.Setenv(envName, "false")
+	defer os.Unsetenv(envName)
+
+	var v Value
+	assert.NoError(t, UnmarshalKey(emptyMap, &v))
+	assert.False(t, v.Enable)
+}
+
+func TestUnmarshal_EnvBoolBad(t *testing.T) {
+	type Value struct {
+		Enable bool `key:"enable,env=TEST_NAME_BOOL_BAD"`
+	}
+
+	const envName = "TEST_NAME_BOOL_BAD"
+	os.Setenv(envName, "bad")
+	defer os.Unsetenv(envName)
+
+	var v Value
+	assert.Error(t, UnmarshalKey(emptyMap, &v))
+}
+
 func TestUnmarshal_EnvDuration(t *testing.T) {
 	type Value struct {
 		Duration time.Duration `key:"duration,env=TEST_NAME_DURATION"`